Updated: December 12, 2025

"Michael Rennie The Keeper" refers to the classic Lost in Space two-part episode where the distinguished British actor Michael Rennie played the alien zookeeper, "The Keeper," a role showcasing his talent for memorable guest spots, a contrast to his famous portrayal of Klaatu in The Day the Earth Stood Still. The Keeper traps the Robinson family, especially the children Will and Penny, in his spaceship's zoo, using a hypnotic staff until Dr. Smith inadvertently helps them escape, with the Klaatu theme music playing during his scenes.

Role: An alien collector who captures exotic creatures and humans, viewing them as specimens for his zoo. Episode: "The Keeper: Part 1 & 2" ( Season 1, Episodes 17 & 18, 1966 ).

Key Moment: He uses a glowing staff to mesmerize Will and Penny, but his hypnotic control is broken when Dr. Smith interferes. Legacy: The role is remembered as a highlight of Rennie's guest appearances, with the original Klaatu theme music even playing during his scenes, creating a memorable crossover feel.