Big Wednesday (1979) and the Broadway musical Pippin (1981).
While driving in the desert, Ralph and FBI Agent Bill Maxwell (Robert Culp of I Spy) encounter a UFO. Its occupants assign them the task of fighting evil, and give Ralph a special flying suit. Unfortunately, he loses the instruction book.
Plots veered between the realistic and the ridiculous. The kids in Ralph's class get a piece of the action, as does attorney Pam Davidson (Connie Selleca), who eventually marries Ralph. But in spite of the "fade out kiss," Ralph's main emotional connection is with Bill. And since Bill doesn't have any superpowers, he gets captured by the bad guys quite often, prompting a daring rescue and a "my hero!" moment.
In its second season, Greatest American Hero was put in a Friday night time slot -- when teenagers were usually out -- and opposite the mega-hit Dallas -- so ratings declined, and it was cancelled.