1977 The Incredible HULK S01E04 The BEAST Within

The Incredible Hulk TV Series 1977–1982 TV-PG
Lou Ferrigno and Bill Bixby in The Incredible Hulk (1977)
A fugitive scientist has the curse of becoming a powerful green monster under extreme emotional stress.
Creator: Kenneth Johnson
Stars: Bill Bixby, Jack Colvin, Lou Ferrigno
S1.E4 The Beast Within Episode aired Mar 17, 1978
Caroline McWilliams in The Incredible Hulk (1977)
David 'Bradburn' is researching control methods for animal aggression with a female doctor at a zoo. She gets into trouble when new animals keep dying from a mysterious illness.
Director: Kenneth Gilbert
Writers: Karen Harris, Jill Donner
Stars: Bill Bixby, Jack Colvin, Lou Ferrigno