The fourth episode of the live-action series based on Marvel’s comic The Incredible Hulk premieres on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno. Richard Kelton (Quark) guest stars. 
David finds work in a zoo where Dr. Claudia Baxter is conducting research into quelling primal rage in animals. Though he’s employed as little more than a glorified janitor, David asks Dr. Baxter in-depth questions about her work, and is surprised to hear her admit that she’s trying to continue the work of the late Dr. David Banner. But her already-controversial research has hit a snag – a string of unusual deaths among animals at the zoo – and David is suspicious of Baxter’s boss, Dr. Malone, and his aide, Carl. He knows he’s getting close to the truth of what’s happening when Carl locks him into a cage with a gorilla, who Carl then injects with a chemical designed to bring its rage to the boiling point…and that’s when the Hulk appears.
written by Karen Harris & Jill Sherman
directed by Kenneth Gilbert
music by Joe Harnell
Cast: Bill Bixby (David Bruce Banner), Jack Colvin (Jack McGee), Lou Ferrigno (The Hulk), Caroline McWilliams (Dr. Claudia Baxter), Richard Kelton (Carl), Dabbs Greer (Dr. Malone), Charles Lampkin (Joe), Jean Durand (Jagger), Norman Rice (1st Zoo Security Guard, Joe DeNicola (2nd Zoo Security Guard), Billie Beach (Rita)
Notes: Richard Kelton (1943-1978) was one of the cast members of the short-lived NBC sci-fi spoof Quark, which was airing at the same time as The Incredible Hulk – in fact, this episode aired opposite an episode of Quark on the same night. He died later in 1978.
LogBook entry by Earl Green