Lost in Space - Season 2 - Eps 28: The Mechanical Men
After Dr Smith is turned away from camp yet again, he awakes from a nap to find he has been tied up by little mechanical men. The Robinson's camp is invaded the mechanical men of INDUSTRO, who claim that they want a leader..their leader. The Robinson's learn that the Robot is what they want, and that if he is not surrendered the mechanical men will attack. When the Robot surrenders, the mechanical men realise he is not the ""evil"" leader they wanted and they subsequently switch his personality with Dr Smith. An attack occurs when Dr Smith returns to camp wth the voice and personality of the Robot, which Don finds hilarious, and uses to full advantage. An attack ensues and the mechanical men are defeated and turn Dr Smith and the Robot back.
About Lost in Space

Title: Lost in Space
First Air Date: 1965-09-15
Last Air Date: 1968-03-06
Status: Ended
Rating: 7.1/10 (from 115 votes)
Language: EN
Seasons: 4
Total Episodes: 83
Network: CBS
Genres: Sci-Fi & Fantasy, Comedy
Production Companies: Irwin Allen Productions, 20th Century Fox Television
Synopsis
The space family Robinson is sent on a five-year mission to find a new planet to colonise. The voyage is sabotaged time and again by an inept stowaway, Dr. Zachary Smith. The family's spaceship, Jupiter II, also carries a friendly robot who endures an endless stream of abuse from Dr. Smith, but is a trusted companion of young Will Robinson
Cast

Guy Williams
Dr. John Robinson

June Lockhart
Dr. Maureen Robinson

Mark Goddard
Major Don West

Marta Kristen
Judy Robinson

Angela Cartwright
Penny Robinson

Bill Mumy
Will Robinson

Jonathan Harris
Dr. Zachary Smith

Dick Tufeld
Robot B-9

Bob May
Robot B-9