Danger, Will Robinson! Without our exclusive clip from the new Lost in Space: The Complete Adventures Blu-ray box set, you might not get a peek at the lost Lost in Space Saturday morning cartoon spin-off.

A pilot episode for the proposed animated spin-off aired as part of ABC’s Saturday Superstar Movie, a weekly movie series for kids featuring animated versions of hit primetime series like The Brady Bunch, Nanny and the Professor, Gidget, and The Munsters. The Lost in Space ‘toon, which featured voice work by original series star Jonathan Harris as Dr. Zachary Smith, aired in September 1973, but failed to spark enough interest to rate follow-up episodes.

The exclusive clip above shows the original concept pitch video for the cartoon, featuring snippets of animation along with drawings yet to be animated, from a scene in which Dr. Smith comes face-to-furry face with a cyclops monster.

The entire cartoon pilot is among the more than eight hours of supplemental materials on the new Lost in Space complete series Blu-ray set, which also includes vintage and new cast interviews; the unaired original series pilot; an original cast performance of series star Bill Mumy’s unproduced 1980 script for a proposed sequel episode; two full-length Lost in Space documentaries; vintage versions of four episodes, complete with original commercials; and all 83 episodes of the 1965-68 CBS series created by Oscar-winning filmmaker Irwin Allen.

Lost in Space: The Complete Adventures is now available on Blu-ray from Fox Home Entertainment

