Updated: August 18, 2026

The Lost in Space B9 Robot is a 1965 television icon designed by Robert Kinoshita, portrayed by Bob May, and voiced by Dick Tufeld, known for its warning phrase “Danger, Will Robinson!” The B9 Class YM-3 General Utility Non-Theorizing Environmental Control Robot is a central character in the original Lost in Space TV series ( 1965 to 1968 ). Created after CBS requested additions to the pilot, it became one of science fiction’s most recognizable robots.

Structure:

Glass bubble sensor dome with antennae Fluted translucent collar Rotating torso with control panels and chest light Bellows arms ending in red mechanical claws Lower tread or leg unit depending on the scene

Costume Robot �" worn by Bob May for most scenes. Stunt Robot �" used when scenes were dangerous or required static shots. This stunt model is one of only two full-scale production-used figures and has been restored and displayed worldwide.

The B9 Robot remains a beloved sci-fi icon, influencing later depictions of benevolent robots and appearing in auctions, replicas, and fan conventions.

The B9 Robot’s distinctive design and personality have secured its place as one of television’s most enduring science fiction characters.