Season 2

After Polly's plane crashes, Polly asks Underdog to pick some flowers while she waits under a tree she thinks is friendly. But the 'friendly' tree turns out to be the witch of Pickyoon. As Polly tries to scream the witch gags her and takes her to her castle. Underdog is at a loss to where Polly is.

The witch gives Polly a potion that puts her to sleep for a thousand years, and states that only a kiss from a hero will break the spell. Meanwhile, Underdog asks the natives of Pickyoon who speak in whispers due to fear of the witch, where he can find Polly. They inform him that she must have been taken by the witch. Underdog heads to the castle to find Polly asleep and insists the witch wake her. She tells him that he must do things for her first. To confirm how strong he really is, she has him go to an arena and fight her 'pets'. After finishing off all the creatures, he again insists she wake Polly. But the witch says she will only do it if he completes 3 tasks.

The witch reveals to Underdog the 3 tasks he must do before she awakes Polly. The first task, she tells him that the land is so dry and she wants him to steal the water from other lands to make Pickyoon greener. Overhearing this, the townspeople say that if he steals water, he will be as wicked as the witch. Instead, he decides to burrow down deep into the ground until he hits water and gushes plenty out to make the land green. For the second task, the witch instructs Underdog to make her land the richest by stealing the wealth of other lands. Instead, he goes to the nearest coal company and using his bare hands forms the coal into diamonds and then sends a truckload to the witch. The final task the witch asks for, is that Underdog leads an army to take over all the world.

Underdog defeats the witch and breaks the curse.

Simon is trying out his latest evil invention, the weather making machine. This dangerous device creates artificial storms and other natural disasters which Simon hopes to use for his own plans of world conquest. But it is not without faults; the weather machine's powers are uncontrollable near itself, that is, Simon's Lab. Cad comes up with an idea: why not use the machine from another spot not on the Earth. Intrigued by this idea and the fact that Sweet Polly Purebred and two astronauts are heading for a moon expedition, Simon and Cad head for Cape Carnival and take over the spaceship and capture Polly. The trio head for the moon with Simon's diabolical weather machine.

Simon and Cad take over the spaceship heading for the moon, taking Polly prisoner. Sensing the danger, General Brainley calls for Underdog. In space, Polly tries to stop Simon, but only succeeds in being tied up. Reaching the Moon, Simon and Cad set their machine. Simon tells General Brainley that unless the leaders of the world turn their power over to him with the next few hours, Simon will unleash his first terrifying storm upon the earth.

Simon Bar Sinister and Cad have reached the Moon and sent their ultimatum to General Brainley and to the world's leaders. Unless the world's leaders turn over their powers to Simon with the next few hours, he will destroy the earth with a artificially created storm from his Weather Machine. The General and the world leaders refuse to give in to Simon's demands. Seeing that they need a demonstration of his power, Simon sends a little sample. Simon's attempts to attack The Pentagon fail because Underdog is able to thwart the storms. Simon decides that he'll press every key on his weather machine to sends numerous storms to earth, destroying everyone and everything in one big storm.

Seeing that Simon can destroy the earth by using all of the artificially created storms at once, General Brainley convinces the leaders of the world that they have no choice but to surrender to Simon. But Underdog will not allow this villain to get away with his mad scheme. He takes his super energy pill and then he spins around at top speed until he becomes invisible and flies right to the moon. Once there, he confuses Simon and Cad, and they start fighting. They end up knocking each other unconscious. Underdog frees Polly, destroys the weather machine and returns Polly, the spaceship and the two villains to earth.

Underdog is requested to deliver gold bricks from the bank to an undisclosed location. But Riff Raff and his henchman Mooch disguise themselves as toll guards and surreptitiously steal the gold. When Underdog gets to the secret location, the gold bricks are gone and Underdog is placed under arrest for grand larceny.

Unwilling to believe that Underdog is guilty of stealing the gold, Polly decides to try and find the real crooks. Her investigations lead her to an old, run down house in the countryside. An old Civil War hermit warns the reporter that ghosts haunt the old house. Polly refuses to believe in such nonsense and heads for the old house to continue with her investigations. Polly enters the house and she meets a group of hideous specters. One leads her into a doorway that is actually an entrance into a bottomless pit. Our heroine falls in. In the meantime, Underdog has his day in court, and is found guilty. The judge sentences our hero to twenty years in prison.

A ghost tricks Polly into entering a bottomless pit. The old haunted house is actually a hideout for Riff Raff and Mooch. The two villains use a combination audio and video devices to create the ghosts and other supernatural horrors to scare away nosey visitors from their hideout. Underdog- sentenced to twenty years for his reputed participation in the theft of the gold- hears Polly's calls for help from the phony haunted house. He escapes from jail and heads for the old house and saves the Polly from the bottomless pit. While searching the old house, the pair find Riff Raff's phony ghost machines and his red paint cans. Underdog now knows who is behind the theft of the gold bricks and heads for the state line to stop the two crooks.

Finally realizing that Riff Raff and Mooch are really the crooks behind the theft of the bank's gold, Underdog goes after the pair. No matter what they try, Riff Raff and Mooch can't stop Underdog. He cleans off the gold bricks and returns them to the banking officials and then turns Riff Raff and Mooch over to the law.

It is the day of the National Olympics, and Sweet Polly Purebred is there reporting the news to the people there and the TV watchers. The first event is the broad jumping contest. One of the contestants jumps, but keeps soaring high and high into the air. Everyone is amazed, but the same thing happens with weightlifter and the pole vault jumper. As a result of these strange incidents, the Olympics are cancelled and scientists get to work getting to the bottom of the incidents. Professor Bruno Heimerdown comes to the conclusion that the phenomenon might have to do with the new planet they recently discovered. General Ricketts has a meeting at the White House that they have to go to the planet and see what's on it, as it might wipe out Earth, and only Underdog is the strongest person to do so.

Underdog arrives at the White House right as the representatives are planning for his trip, writing that it will take 14 years to get to the planet and also that Underdog needs lots of equipment. Polly arrives and wants to go with Underdog to get a report of the story, and despite Underdog telling her it's dangerous, she still goes. Underdog blasts off and gets to the planet flying at lightning speed. He and Polly get ready to eat, when all of a sudden two metallic men use their magnetic powers to take all of their supplies to start eating them. Underdog tries to fight them but fails, and he and Polly get stuck to one huge magnet.

The Magnet Men tell Polly and Underdog, who are still stuck to what is their great gravity gun, that they are hungry and want to eat metal. As a result, they are forced to go back to Earth and to tell everyone to give everything they have metal to them within 24 hours, or else the men will use the gun to pull the Earth away from the sun. They have no choice but to do what they say. However, no one believes Polly's announcement on television, and so everyone in town mobs her studio. Even Professor Bruno Heimerdown doesn't believe them. Polly and Underdog fear they have no choice but to face the Earth's destruction.

After the 24th hour passes, the Magnet Men switches on their gravity gun which moves the Earth from its place and far from the sun. Not only do buildings and boats tip over, but water freezes and it starts snowing. Underdog and Polly realize that the reason why the gun attracted them were because of Underdog's metal ring and Polly's metal bracelet. Underdog flies back to the magnet planet without his ring and successfully fights the Magnet Men, destroying them and the gun. He manages to get the Earth back to its place in the sun and all's well that end's well.

Sweet Polly Purebred calls on Underdog to remind him that it's his birthday, and that she plans to give him a party. Meanwhile, the curator in London wishes to loan the famous Excalibur Sword Collection to the San Francisco Museum. Fearing that someone will steal try to steal it, they send a message to Underdog for his assistance to guard the collection. While en route via train, Riff Raff and his gang attempt to steal the sword collection by derailing the train. When the train wrecks, Underdog engages Riff in a duel with the sword collection that was scattered from the wreck. Riff and the gang flee and Underdog attempts to put the train back on the track but seems to be in pain from his back. An ambulance is rushed to the site.

While Underdog is in the hospital for his pain that puzzles the doctors, word of his plight reaches Riff Raff who sees this as an opportunity to steal the Excalibur Sword Collection that is being shown in the San Francisco museum. As night falls on the museum, Riff and his henchman, Mooch, emerge from being hiding in medieval costumes. When Riff lifts the casing to the Excalibur collection, he trips an alarm and the police come. Riff and Mooch defeat the police by landing a chandelier on the police when they gather in the center of the room to trap him. They then steal the Excalibur Sword collection.

In order to take the swords out of the country, Riff Raff hides them in candles. Meanwhile, Sweet Polly decides to throw a birthday party for Underdog in the hospital. When she goes to get candles, she discovers Riff Raff. He puts her on the candle assembly line, headed for the wick cutter.

Withstanding his pain, Underdog saves Sweet Polly and captures Riff Raff, recovering the Excalibur Swords. However, one of the swords is missing. After an intense search, the missing sword turns out to be behind Underdog's cape- which solves the pain mystery. Polly and the doctors then sing a rousing rendition of "Happy Birthday" to our hero... and he blows out the candles on his cake, and some of the icing lands on the caretakers' faces.

When crops from all over begin to disappear, Sweet Polly decides to visit the location of the disappearances. She falls into a hole and lands underground. There she is met with King Mange, who explains that he and his men have been stealing the crops to weaken the surface dwellers so that they can conquer the Earth. Polly tells them that Underdog will stop them, to which King Mange replies that their weapon, the Molehole gun will burrow a hole into anyone, including Underdog.

Upon hearing Polly's cries for help, Underdog races to the her aid by burrowing down into the Earth and reaching the lair of the Mole Men. King Mange unleashes the Mole-hole gun on him, but it only slows him, but does not bore a hole into him. King Mange then aims at his feet and Underdog falls into the craters the gun makes, but still continues his advance. Seeing Underdog punch each of the gun's projectiles away and moving closer, Mange releases the giant ant. Although Underdog fights valiantly, his fight with the Molehole gun weakened him, and finally succumbs to the giant ant. Both he and Polly are placed in a cage with a giant caterpillar, where they are wrapped in a cocoon.

Trapped in a cocoon, Underdog instructs Polly to give him the Underdog super vitamin pill hidden in his ring so that he may regain his powers. Once he takes it, they escape and unravel the cocoon, and Underdog punches the large caterpillar between two stalagmites. King Mange again releases the giant ant. Underdog acts as a matador against the charging giant ant. While Polly is cheering Underdog, a menacing giant spider comes down and grabs her, placing her in its web. Underdog quickly finishes off the giant ant and comes to Polly's aid, but is momentarily caught into the web. Once free, he toys with the spider but the vibration loosens Polly and she falls into the net of the awaiting Mole Men below. As Underdog approaches, King Mange aims the Mole-hole gun at her and tells him to back off or he will bore a hole in her.

Underdog defeats the Mole Men.

King Cup - the evil, spoiled monarch of The Flying Sorcerers' planet - can't get cake that tastes good. So he send his sons Bric and Brac to find a new baking slave. Their efforts are not too successful, since they get slaves from the planets of Zot and of the Magnet Men. Then King Cup sees Polly hosting a TV cooking show on Earth and he knows he has found his new baking slave. The Evil despot sends Bric and Brac to Earth to capture Polly.

Polly is caught by the two royals, but gets off a call to Underdog for help. After seeing his true love being captured by the aliens, Shoeshine Boy runs into a phone booth and becomes Underdog. Bric and Brac use their evil space magic to turn our hero into a basketball, and Underdog is sent bouncing along into a kid's field game.

Polly is brought before King Cup, and he orders Polly to bake five hundred cakes. The cakes are good, but not enough for King Cup and his people. He orders Polly to bake five thousands cakes. She tries to make the cakes in a giant mixing bowl. Because of her fatigue, she falls into the mixing bowl and is coming dangerously close to the blades.

Underdog defeats King Cup.

Simon becomes increasingly frustrated with Underdog always stopping him in his endeavors. Cad suggests that the only way to stop him is if he forgot who he was. So Simon embarks on a quest to create an amnesia weapon. His first attempt which has the victim seated in a chair and have a hammer land on their head works, but Cad reads that the machine's not effective on people with hard heads. So Simon tests it on Cad, and finds the latter was right. Finally, Simon reads about creating a Forget-Me-Net, which, when placed over someone, makes them forget who they are. After successfully trying it on a victim, he then sets out to try it on Underdog.

Simon sets out to lure Underdog so that he can try his Forget-Me-Net on him. First he robs a jewelry store, encouraging the people to call for Underdog. However, our hero is detained fighting a typhoon halfway around the world. Next, Simon holds up a toy store, but again Underdog is busy fighting off pirates. Finally, Simon goes to the television station where Sweet Polly Purebred is finishing her show. He captures her and unless Underdog comes, she will not be seen again.

Underdog finally arrives on the scene to rescue Sweet Polly only to be caught in Simon's Forget-Me-Net. Realizing that if he hears his name he will regain his memory, Simon disguises Underdog as an old lady who sells apples. Cad then escorts the newly persona of Underdog in the streets where people who recognize him are kept at bay. Simon finally has created his large Forget-Me-Net to fulfill his plan to drop it over Washington, D.C.

After completing his giant net to cast over Washington, Simon calls upon Cad to assist in folding the net. Meanwhile, a disguised Underdog meets up on Memory Lane with an amnesia stricken Sweet Polly. Recognizing familiarity of the face, Underdog asks her name which she can't remember. They decide to go through the alphabet and try to guess it. Soon the two discover her name and she regains her memory. She and others attempt to hit Underdog over the head to regain his memory, to no avail. It is only when she says his name does he remember. She then informs him of Simons plan. Underdog races to the plane Simon and Cad are in with the net, and flips it over. He then makes a bag of the Forget-Me-Net and places them both into it and lands them on the ground not knowing who they are.

At the Mid-town Modern Art Muesum, a special showing was being held for the painting "Whistler's Father." As Riff Raff sets out to steal the famous painting, Whistler's Father. To do so, he calls upon the services of many gang hooligans. Each have a specialty. Riff Raff informs the gang that they will be using guerilla warfare tactics to try to rob the painting from the museum.

Riff Raff shows his newly formed gang the tactics of guerilla warfare. Sweet Polly Purebred goes to the museum where Underdog is standing by guarding the Whistler's Father painting. Meanwhile, outside, Riff and the gang are disguised as horses to carry out the first guerilla warfare tactic 'Hit and Run'. As the horses stampede the museum they steal the painting. But Underdog gives chase and catches them at the Finish Line he sets up.

The next plan is camouflage and sabotage. They wreck the museum's equipment and disguise themselves as two columns, a statue and a wastebasket to grab the painting while Underdog is fixing the broken museum equipment, after taking his Super Energy Pill. But Underdog stops them. Riff Raff's last plan might not only work, but he could also find out Underdog's secret identity.

Riff Raff disguises himself as a museum director and hangs a bag of birdseed with a hole in it on Underdog's back. The seeds leave a trail to Shoeshine Boy's apartment. Fortunately, Underdog is able to use his super-speed to fool them into thinking there are 2 different people, and Underdog takes them to the Garbage Bins on a Truck & then gives the man driving the truck to give them away with the rest of the trash & the painting was safe & people looked into the sky & said "It's a Plane," "It's a Bird," "It's a Frog.'" with Underdog saying his famous quote, before crashing into the painting.

One night, in a new scheme, Simon takes Cad to a street corner where he shows him a tricky traffic light control box. On the box are two buttons; one will sound an air raid siren that will send everyone in the city into their homes or air raid shelters. When Simon pushes the second button, it will slam all the doors and windows shut and trap everyone inside thus making the plunder of the city easy. The two fiends leave the scene to prepare for the take over of the city.

The next morning, the pair are stopped by a cop as they head for the street corner to push the buttons on the tricky control box. The cop tells them that it is Thanksgiving Day and the parade will be marching down the streets for hours. Hence, no one is permitted to cross the streets. This doesn't stop Simon. Together, the two villains head back to Simon's basement lab where Simon takes out one of his time bombs. The evil twosome will travel back in time to prevent the Pilgrims of 1621 Plymouth Rock from becoming friendly with the Indians and starting the Thanksgiving tradition. But the two villains are unaware that Sweet Polly Purebred has been following them and she calls for Underdog for help. Sweet Polly and Underdog head for the two villains' basement lab where they find Simon's hidden cache of time bombs in a secret compartment behind a bookcase.

After arriving in 1621, Underdog and Sweet Polly meet the pilgrims, and Underdog proves that they're friendly when he does favors for them. Meanwhile, Simon poses as an Indian medicine man and tricks the Indians into thinking that the pilgrims are attacking them, having Cad fire weapons from behind a tree. After both the Indians' reservation and the pilgrims' settlement are destroyed, Simon and Cad return to the 20th century where the Thanksgiving Day Parade and all the remnants of Thanksgiving are gone. With this interference out of the way, Simon gives his army the signal and the villain's armed forces begin their assault on the city. In the past, Underdog and Polly try to stop the war between the Indians and the Pilgrims, but neither side is willing to stop fighting and apologize.

Underdog defeats Simon.

Armies of ghostlike creatures are stealing all of the Earth's silver. Earth's military forces and the police are powerless to stop these crooks because the creatures disable the authorities' weapons with lightning bolts. One night, one of the silver thieves steals Underdog's silver ring. When he is wakened by the theft, he is shocked by his assailant and left frozen solid.

An electric shock from one of the silver thieves paralyzes Underdog. Everyone in the city tries to revive him, but their efforts fail to bring him back. In desperation, they pour sand on him and somehow the sand brings him back to life. When the citizens tell Underdog about these ghostlike creatures that are stealing the silver, he explains that the crooks are actually Cloudmen from another planet in a distant solar system and that they're stealing the silver in order to give themselves a silver lining. Taking Sweet Polly Purebred in his arms, the pair head for the Cloudmen's planet. There, Underdog tries to fight King Cumulus Regulus and his Cloudmen. But without his ring and his super energy pills, our hero is unable to fight against the electrifying powers of the Cloudmen. Soon both Underdog and Polly are paralyzed.

King Cumulus Regulus and his Cloudmen shock Underdog and Polly into paralyzation and the pair are placed on a conveyor belt, to be melted down and turned into silver powder. The Cloudmen then leave for the planet Earth to steal more silver.

Underdog saves the day

Riff Raff and his mob have tried 9 different crimes in the last month but Underdog stopped them all. So Riff decides to move out West. He leaves the city and takes over a little western town, renaming it "Riffraffville."

With all the crooks in Riffraffville, Underdog does simple things like getting cats out of trees. He falls and his ring gets bent. Sweet Polly Purebred offers to take it to fixed but Underdog reminds her about the energy pill and adds that he be vulnerable without it. Riff invites Polly to come to a dude ranch and grabs her.

Underdog sets out to find Sweet Polly. He looks on a train, in a bank and at a cattle ranch. At the train and bank, his energy is drained by bombs set by Riff's gang. At the ranch, he's run over by the cattle. A cowboy tells Underdog where Polly is, so he flies to Riffraffville with the last of his strength.

A western song plays during this cartoon as Riff Raff challenges Underdog to a gunfight at noon. The townspeople are too scared to help Underdog- it looks like the end- but Sweet Polly frees herself and gives Underdog his ring. He takes his energy pill and beats Riff and his gang giving the people their town back.

After many attempts of trying to take over the world failing, Simon and Cad are out of ideas. However, they spot voting posters all over the place, and that gives Simon the idea to run for dictator so people have to do what he says. He replaces all the posters with himself and goes over to houses trying to get people to vote for him, but they don't want to because of how wicked he is. Simon decides that him and Cad will vote for himself.

Back at his lab, Simon will be sure that he will win even with two votes - by making sure nobody else votes. Simon tries a series of rays on Cad that affect his mood, such as crying and relaxing, but each time Cad whatsoever makes his way to the voting machine and pulls the lever down to vote. Meanwhile, as Underdog tries to lift the Leaning Tower of Pisa when it falls, Sweet Polly Purebred arrives to Underdog the news. At last, Simon has the perfect weapon to make sure no one votes, a ray that tickles with feathers causing Cad to laugh hysterically.

Simon uses his tickle feather machine on some people that cause them to laugh. Sweet Polly notices the strange laughing phenomenon when she interviews voters who just walk by and laugh. Seeing Simon, she goes to tell Underdog who doesn't worry, because there are millions of voters across the country. Simon and Cad realize this as well, and so Simon decides to mass-produce his magical tickling feathers and dump them everywhere, so everybody everywhere laughs endlessly. Once Underdog finishes his business with the Leaning Tower, he flies to the voting booths with Polly where the two villains cast the votes. Simon makes feathers tickle both Polly and Underdog.

With Simon successfully being elected as a dictator, and Underdog not being able to stop him, he demands Cad to bring him a banker, a builder, a baker, and Polly. He gives the four specific orders that they must follow: banker has to give him a lot of money, builder has to build a palace, baker has to make him a meal, and Polly has to put on a TV show for his entertainment. Once Underdog breaks free from the tickling, he goes over to Polly's TV studio and tells her that Simon and Cad weren't registered to vote, so their votes didn't count. As a result, everyone working for Simon takes everything back from him. Underdog bends the tickle gun so when Simon shoots it, he shoots it at himself making him laugh. And Underdog gets rid of all the feathers by blowing them off Earth.