In 1977, Jeff moved on to his first "adult" role, as a college student who participates in a deadly hazing in The Hazing, also released as The Case of the Campus Corpse. As if overcompensating for the censorship of Disney studios, he takes everything off -- he spends about half the movie in nothing but a revealing jockstrap.
His most famous role came in 1978, when he played the teenage Clark Kent (but not his voice) in the blockbuster Superman.
Afterwards he continued to act, but mostly in low-budget projects. Pumpkinhead (1988) was memorable for the same-sex romance between his harassed camper Chris and country boy Bunt (Brian Bremer), but most were of little interest for gay fans.
Today, somewhat chunky, no longer blond, but still handsome, Jeff East has retired from acting and works in real estate.