List of The Hardy Boys/Nancy Drew Mysteries episodes

Joe and Frank Hardy, suspicious of their father's "fishing trip", follow him and become involved in the search for an amnesiac ex-soldier being chased by killers for some secret he knows. They end up at a club called the Haunted House that has mazes, trapdoors, and secret passageways.

First appearance of Shaun Cassidy and Parker Stevenson as The Hardy Boys.

Nancy Drew and her friends see a beam of light coming from a supposedly abandoned lighthouse, and a professor tries to convince her that it is haunted. The local sheriff thinks they're imagining things, so it's up to Nancy to solve the mystery.

First appearance of Pamela Sue Martin as Nancy Drew.

Frank and Joe Hardy try to visit Captain Maguire, the uncle of their father's assistant Callie, but discover that he disappeared in a mysterious wooded place called Witches' Hollow. Their only clues are a mute's sketches.

Nancy Drew and her friend, George, see an automobile run off the road, but the sheriff tells her that the road has long been closed and there is no trace of the accident.

The Hardy Boys, while doing some legwork on a case of their father's involving a missing Russian scientist, see a UFO that leads them to a mysterious mansion full of illusions, where floors disappear and rooms change size.

A burglary at her home leads Nancy Drew to investigate her aunts' attempt to sell their farm, which someone is apparently trying to make them believe is haunted.

While assisting in a missing persons investigation for their father, the Hardy boys believe they have discovered a murder plot against a famous rock musician, but no one believes them.

When Nancy Drew and her friends revive a 20-year-old play to raise money for a youth center, they are astounded when five members of the original cast return to perform in it, especially when the theatre is supposed to be haunted.

The Hardy Boys investigate a crooked disc jockey and a case of record piracy. Joe Hardy makes his singing debut at a disco where Frank recognizes a girl who has been missing for three years but denies her identity when confronted.

Nancy and her friends are at a benefit performance at a carnival when they witness a jewel robbery. Suspecting a gang of bikers, Nancy goes undercover as a runaway who wants to join the carnival.

While the Hardy Boys are in Hawaii for a surfing contest, their hotel room is robbed. Discovering that they're not the only victims, the two detectives volunteer to help the Hawaiian police apprehend the burglars.

Taking a luxurious ocean cruise, Nancy and her friends go into action when a famous mystery writer on board receives death threats that follow one of his own plots.

The Hardy Boys discover a box at the beach that contains a priceless jade statue. This plunges them into a case involving smugglers and an extortion plot against a community of Chinese-Americans.

Nancy Drew and her girlfriend attend a college victory party where they find a football star standing over a dead girl with the murder weapon in his hand.

Frank and Joe go to Transylvania to find their father, who disappeared while investigating a series of European art thefts. They encounter Nancy Drew and Bess at a festival called Dracula's Castle, and end up joining forces.

The Hardy Boys and Nancy Drew meet a group of musicians (led by songwriter Bernie Taupin in his acting debut) and Joe talks them into playing a gig at the Dracula's Castle festival, with Joe as one of the singers, so they can get in to search for their father.

In Egypt, the Hardy Boys investigate after a young woman denies that the handbag Frank recovered is hers, and he is left holding a golden idol stolen from one of the pyramids.

When the attendees at a detectives convention start disappearing during a Hollywood film studio tour, the Hardy Boys and Nancy Drew again join forces to investigate.

Frank tries to solve the mystery why three of the top detectives at the show, including the Hardys' dad, are kidnapped for ransom. Meanwhile Nancy searches for Joe after learning that he has been kidnapped by the mysterious Phantom.

Frank and Joe Hardy accompany their father to Kenya to investigate a huge poaching operation on a game preserve.

In Nevada, the Hardy Boys try to help a girl whose boyfriend appears to have been abducted by aliens.

After the pilots are mysteriously knocked out, Frank and Joe Hardy crash land a commercial airplane full of gorgeous stewardesses on a deserted island in the Bermuda Triangle after a major tropical storm.

Summoned to Mexico to deliver an important file to their father, Frank and Joe Hardy get their dad into more trouble by delivering it to two American girls by mistake.

Nancy goes undercover at an exclusive tennis tournament to keep a kleptomaniac classmate out of trouble during a crucial match, although Nancy and her best friend George don't mind the handsome tennis pro.

Frank and Joe Hardy try to track down a deaf girl who is in danger because she accidentally found out about a terrorist's bomb plot by reading the man's lips.

Nancy Drew is determined to prove the innocence of an elderly derelict who believes he is Santa but has been jailed for a series of burglaries.

In New York City, Nancy Drew and a former champion boxer try to expose a plot to assassinate the visiting British Foreign Secretary. Final appearance of Pamela Sue Martin as Nancy Drew, and also Nancy's final "solo" episode (all Nancy's future appearances were in team-ups with the Hardy Boys).

On the Fourth of July, the Hardy Boys stop in a small town to help their friend Harriett with a concert, but they become suspicious when she acts strangely and then gets arrested for a hit-and-run accident.

Joe Hardy tries to help a young woman with psychic powers who is mysteriously drawn to a spooky old house.

Note: This episode shares elements with the book, The House on the Cliff.

Joe Hardy awakes from a coma to find that he's been out of it for a year, and his brother Frank and his father Fenton died eleven months ago, but soon discovers that not everything is as it seems.

In New Orleans for Mardi Gras, Frank and Joe Hardy have their wallets stolen. They get unexpected assistance from Nancy Drew, who is working undercover there as a magician. First appearance of Janet Louise Johnson as Nancy Drew.

Finding voodoo dolls in their hotel room, dead men and coffins are only a few of the Hardy Boys' problems.

On board a ski train to Austria, a frightened girl fleeing from thugs gets the Hardy Boys and Nancy Drew into hot water when she switches bags with Nancy.

While windsurfing in Hawaii, Frank Hardy tries to rescue a girl who disappears and is claimed to be dead. He then becomes obsessed with finding out what happened to her, but someone else is watching him, who is also on her trail.

Frank and Joe Hardy try to find out what has happened to Nancy Drew, who is being held captive by a reclusive former movie star, while a deranged girl plans to set fire to the building. Final appearance of Janet Louise Johnson as Nancy Drew.

The Hardys head east to New England when an old girlfriend of Joe's calls, saying that some classmates of hers have gone missing at Eastlake University.

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.

Patrick Macnee guest stars in this unofficial crossover with The Avengers.^[1] 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. Final appearance of Shaun Cassidy and Parker Stevenson as the Hardy Boys.