Seasons & episodes

A deaf woman witnesses a terrorist negotiating plans on the telephone.

Nancy is determined to restore the honor of a dear old gentleman who claims to be Santa Claus when he is accused of burglary.

Nancy is held for psychiatric observation when she tells the police an unbelievable story.

The lead singer of a rock band runs down investigative reporter Jerry Morgan.

Townspeople revile a psychically gifted girl (Melanie Griffith) who has a mysterious tie to an eerie mansion.

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.

While in New Orleans for Mardi Gras, Frank and Joe's wallets are stolen; Nancy works under cover as a magician.

The brothers find a dead man in a coffin in their hotel room.

While aboard a ski train to Austria, a frightened girl fleeing unknown assailants switches flight bags with Nancy.

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.

A reclusive billionaire (Joseph Cotten) holds Nancy captive in his penthouse, and a girl (Cathy Rigby) sets fire to the building.

The boys go under cover at a New England college where three coeds have been kidnapped.

After Joe Hardy's fiancée is killed by a hit-and-run driver, the FBI won't let the police arrest the man until their own case against him is finished. Joe takes the law into his own hands and goes undercover as a rich gambler with underworld connections.

Joe Hardy is still haunted by memories of his dead fiancee, but has to focus his mind on the case when Jocco's girlfriend overhears him talking to the police on the phone. Meanwhile, Frank Hardy tries to help Joe by going undercover too, but Jocco finds out and traps Frank in a shark-infested area.

S3 · E3Assault on the Tower 1978-10-15 · 47 min＋

Joe and Frank Hardy go to London to find their missing father, but when Frank goes missing as well, Joe and an agent from the British Ministry must find a traitor together.

In Greece to investigate drug smuggling, the Hardy Boys pose as archeology students on a dig for the lost city of Atlantis, but they are dogged by suspicious accidents and a dead body.

Frank and Joe Hardy journey from the South of France to the Caribbean to find a girl who disappeared while hunting for pirate treasure.

Frank and Joe Hardy are assigned to go to Puerto Rico to protect a senator's daughter from an international blackmailer known as the Scorpion.

When the daughter of a Russian official defects to the U.S. by hiding in one of the rock band Bread's speaker cabinets sent to Hawaii, the Hardy Boys must track her down before the KGB does.

Marla falls for an American agent, but Soviet killers pursue her.

A woman executes a securities scam from Atlantic City casinos using a code that the Hardy Boys must break.

Joe and Frank are assigned to protect a motocross racer, the daughter of a mob informant who has been threatened by assassins, but a strange woman has become obsessed with Frank.