What was the name of the robot on the 1960s sci-fi series Lost in Space who often said 'Danger, Will Robinson'?

The Robot is the answer. On Lost in Space, the 1960s CBS sci-fi series created by Irwin Allen, The Robot traveled with the Robinson family aboard the Jupiter 2 and became closely tied to Will Robinson through its warning role, mechanical personality, and comic-science-fiction presence.

The Robot on Lost in Space

The robot on Lost in Space was commonly called The Robot. The character is also often identified in later references by model-style names such as Robot B-9. The series premiered on CBS in 1965 and followed the Robinson family after their space mission aboard the Jupiter 2 went off course.

Will Robinson and the Jupiter 2

The Robot was part of the Jupiter 2 crew’s survival setup and often acted as a warning system when danger approached. Will Robinson, played by Bill Mumy, had a close connection with the robot, which made the character especially important in scenes involving threats, exploration, and problem-solving. The Robot’s mix of protective behavior and odd mechanical personality helped it stand apart from ordinary spaceship equipment.

The Voice and the Catchphrase

Bob May performed inside the robot suit, while Dick Tufeld provided The Robot’s voice. The phrase “Danger, Will Robinson” became strongly associated with the character in popular culture, even though exact wording and regular usage in the original series are often remembered more broadly than they appeared on screen. The Robot remains closely tied to Lost in Space because of its design, voice, warning role, and relationship with Will Robinson.