Lost in Space

Lost in Space reference content. See the updated Lost in Space section.

Frequently Asked Questions

What is Lost in Space and why does it matter to the prop replica community? Lost in Space was a CBS science fiction television series that aired from September 15, 1965 to March 6, 1968 for 83 episodes. It produced some of the most recognized props in television history, particularly the B9 robot, which became the centerpiece of an active international replica builder community that has continued for decades.

Who are the key people behind the original Lost in Space B9 robot? Producer Irwin Allen commissioned the B9 robot design, which was built by Bob Stewart and his team for the 1964 pilot at a cost of approximately $40,000. Actor Bob May physically performed the robot in all 83 episodes, while Dick Tufeld provided the iconic voice in post-production. Bob May’s contribution was not screen-credited at the time, as the robot was classified as a special effect.

How many seasons did Lost in Space run and what changed between them? Lost in Space ran for three seasons (1965–68) totaling 83 episodes. The B9 robot prop was modified between seasons — tread section proportions changed, the chest panel layout was revised, surface details were added or changed, and arm assemblies were rebuilt. Most replica builders target the Season 2–3 configuration, which is more thoroughly documented in community reference threads.

Where can Lost in Space reference content be found on this site? The Lost in Space section of this site covers the B9 robot’s history, tributes to key figures like Bob May, and prop replica guides including the B9 robot and Mystic Seer from Twilight Zone. The B9 robot construction overview provides the complete build scope, and the mold making and resin casting sections cover the foundational fabrication skills.