The Hardy Boys/Nancy Drew Mysteries - Season 3 (1978)

To investigate a heroin smuggling ring, the boys infiltrate an archaeological dig for Atlantis that is plagued with threats and sabotage.

The Hardy Boys search for a missing young woman who is herself searching for buried treasure. Can they save her from her own greed?

Frank and Joe go up against a dangerous international kidnapper, with Joe guarding his intended victim while Frank tries to get information out of their enemy's daughter.

A Russian General's daughter attempts to defect to the U.S. by hitching with the Bread band. Upon landing, she disappears. Frank and Joe race against the KGB to find her.

As Frank and Joe continue to race against the KGB to find Marla first, an undercover Federal agent, Paul Owens, may have his own agenda to find Marla first.

Frank goes undercover to take down a security racket. Meanwhile, there's a mole inside the department.

Frank & Joe investigate the strange and dangerous happenings at a motor cross biking event.