But lest we all forget, Robby did make a guest appearance on Lost in Space season 1, episode 20, "War of the Robots".
I had a viewmaster disk set of that featured Robbie fighting Robot, in color, no less!
You’re right. Robby the Robot was in the film Forbidden Planet.
The robot in Lost In Space was actually Robot B-9, Class M-3 General Utility Non-Theorizing Environmental Control Robot.
But everyone just called him Robot.
Which used to be pronounced “Roe-bit”
But lest we all forget, Robby did make a guest appearance on Lost in Space season 1, episode 20, "War of the Robots".
I had a viewmaster disk set of that featured Robbie fighting Robot, in color, no less!