How Many Robots Are There?
Lost in Space never provides a full head count for the amount of robots in action throughout the series. In the climactic scenes of the seasons 2 and 3 finales, however, there appear to be at least dozens of robots and maybe even hundreds. Ultimately that should be more than enough firepower to eradicate the human problem from their interstellar neighborhood as robots are very powerful.
Though we don’t know the exact number in play, there are a handful of “main” robots that the Robinsons and Alpha Centauri colonists have encountered and named. The first is, of course, Robot himself. Then there’s the series antagonist SAR (or “Second Alien Robot”). There’s also Scarecrow, a robot the jerks aboard the Resolute enslaved to harness interstellar travel. In the show’s final episode, Penny Robinson befriends a robot she names Sally.
All in all, that’s a lot of robots with names for actors to keep track of…particularly…