Question: Who played the robot in lost in space?
Disambiguated questions and answers: question: Who played the robot in the 1965 TV series lost in space?
Who played the robot in the 1998 film lost in space?
Who played the robot in the 2018 TV series lost in space?
answer: Bob May
Dick Tufeld
Brian Steele
Natural Questions answer: Bob May (from the Wikipedia article "Bob May (actor)")