Nancy and the brothers team up to find Fenton Hardy, who disappeared while investigating a series of European art thefts.
Guest Stars:
Fritz Feld, Lorne Greene, Paul Williams, Albert Carrier, Ed Gilbert
Allison Troy's Transylvanian rock concert has locals fearing a reawakening of their most notorious denizen.
Guest Stars:
Fritz Feld, Lorne Greene, Paul Williams, Albert Carrier, Ed Gilbert
After a young woman denies the handbag he recovered is hers, Frank is left with a stolen Egyptian idol and a pile of trouble.
Guest Stars:
Cesare Danova, Taryn Power
Nancy and famous criminologist Arlo Wetherly find mutilated photos of themselves.
Guest Stars:
Clive Revill, Robert Wagner, Jaclyn Smith, Casey Kasem, J.D. Cannon
Frank & Joe team up with Nancy Drew again in Los Angeles to attend the 14th Annual Detectives' Convention at a TV & movie studio. Joe pursues an illusory figure through the back lot of the studio's stage 24.
Guest Stars:
Clive Revill, Casey Kasem, J.D. Cannon, James Wainwright, Floyd Levine
Frank and Joe travel to an African game preserve to trap the mastermind of a huge poaching operation.
Guest Stars:
Anne Lockhart, Percy Rodriguez, Parley Baer, Harold Sylvester, Albert Popwell
The Hardy boys spot peculiar, alien-like people on an old missile site being guarded by federal agents.
Guest Stars:
John Quade, Tony Dow, Britt Leach, John Brandon, Hunter von Leer
Frank and Joe are invited to join a charter flight which passes over the Bermuda Triangle.
Guest Stars:
Thayer David, Robin Mattson, Frank Parker, William Sylvester, Katherine Moffat
While in Mexico trying to solve the mysterious kidnapping of their father, Frank and Joe discover hang gliding and dangerous enemies.
Guest Stars:
Kimberly Beck, Deborah Ryan, Ed Gilbert
Nancy goes under cover to keep a light-fingered tennis star out of trouble.
Guest Stars:
Jack Colvin, Nico Minardos, William Schallert, Christopher Connelly, Maureen McCormick
A deaf woman witnesses a terrorist negotiating plans on the telephone.
Guest Stars:
Kenneth Tobey, Val Avery, Larry Storch
Nancy is determined to restore the honor of a dear old gentleman who claims to be Santa Claus when he is accused of burglary.
Guest Stars:
William Campbell, Sparky Marcus, William Schallert, Missy Gold, Antony Carbone
Nancy is held for psychiatric observation when she tells the police an unbelievable story.
Guest Stars:
John Karlen, Nicholas Hammond, Simon Oakland, William Schallert
The lead singer of a rock band runs down investigative reporter Jerry Morgan.
Guest Stars:
Nancy Stephens, Skip Ward
Townspeople revile a psychically gifted girl (Melanie Griffith) who has a mysterious tie to an eerie mansion.
Guest Stars:
Wayde Preston, Dorothy Malone, Melanie Griffith, Lloyd Bochner, Royal Dano
Joe awakens in a Hong Kong hospital and is led to believe that he has been comatose for a year and his father and brother are dead.
Guest Stars:
Robert Horton, Barry Primus, Chao-Li Chi, James Hong, Diana Muldaur
While in New Orleans for Mardi Gras, Frank and Joe's wallets are stolen; Nancy works under cover as a magician.
Guest Stars:
Bobby Troup, Johnny Sekka, George Dunn, Linda Dano, Kim Cattrall
The brothers find a dead man in a coffin in their hotel room.
Guest Stars:
Bobby Troup, Johnny Sekka, George Dunn, Linda Dano, Kim Cattrall
While aboard a ski train to Austria, a frightened girl fleeing unknown assailants switches flight bags with Nancy.
Guest Stars:
Tommy Sands, Edd Byrnes, Deborah Walley, Fabian, Troy Donahue
While windsurfing in Hawaii, Frank tries to rescue a girl named Maryann (Maren Jensen) who disappears and is claimed to be dead. He then begins to become obsessed with finding out what happened to her, but someone, who is also on her trail, is watching him.
Guest Stars:
Maren Jensen, Tony Scott, Tara Buckman, Jack Jones, Jack Hogan
A reclusive billionaire (Joseph Cotten) holds Nancy captive in his penthouse, and a girl (Cathy Rigby) sets fire to the building.
Guest Stars:
Zina Bethune, Eric Server, Pernell Roberts, William Schallert, Cathy Rigby