The Greatest American Hero - Season 2 - Eps 7: The Lost Diablo
Bill has a treasure map, and takes Ralph and his class out to the desert to find the lost Diablo Gold Mine that vanished a long time ago, and are met with resistance from the local thieves.
About The Greatest American Hero

Title: The Greatest American Hero
First Air Date: 1981-03-18
Last Air Date: 1983-03-03
Status: Ended
Rating: 7.2/10 (from 104 votes)
Language: EN
Seasons: 4
Total Episodes: 43
Network: ABC
Genres: Action & Adventure, Comedy, Crime
Production Companies: Unknown
Synopsis
The chronicles of teacher Ralph Hinkley's adventures after a group of aliens gives him a red suit that gives him superhuman abilities. Unfortunately, Ralph, who hates wearing the suit, immediately loses its instruction booklet, and thus has to learn how to use its powers by trial and error, often with comical results.
Cast

William Katt
Ralph Hinkley

Robert Culp
Bill Maxwell

Connie Sellecca
Pam Davidson

Faye Grant
Rhonda Blake

Michael Paré
Tony Villicana

Jesse D. Goins
Cyler Johnson

Don Cervantes
Paco Rodriguez