Robot (Lost in Space) arms. The Robot was performed by Bob May in a prop costume built by Bob Stewart. The voice was primarily dubbed by Dick Tufeld, who was also the series' narrator, and Jorge Arvizu for the Spanish dubbing. The Robot was designed by Robert Kinoshita, who also designed "Forbidden Planet"'s Robby the Robot. Robby appears in Lost in Space episode #20 "War of the Robots" and in episode #60 "Condemned of Space". The Robot did not appear in the unaired pilot episode, but was added to the series once it had been greenlit. Initially, the bellows-covered legs were articulated, and were
Planet of Evil but name, the Id monster from the 1956 MGM feature film "Forbidden Planet"." Howe and Walker also praised the jungle set and the performances of Frederick Jaeger and Ewen Solon, but criticised Prentis Hancock's "poor" portrayal of Salamar. Ray Dexter's assessment of "Planet of Evil" also acknowledged the influence of the 1956 film "Forbidden Planet", which inspired the writers to include an invisible, murderous monster, as well as elements of "Jekyll and Hyde". Reviewing the serial in 1999, literary critic John Kenneth Muir drew attention to similarities between "Planet of Evil" and Ridley Scott's 1979 film, "Alien", in particular the