Who played the robot in lost in space?
No context provided
Who played the robot in the 1965 TV series lost in space?
Bob May
In 1998, Burns produced a television special about the series hosted by John Larroquette and Robot B-9 (performed by actor Bob May and voice actor Dick Tufeld). The special was hosted within a recreation of the "Jupiter 2" upper deck set. The program ends with Laroquette mockingly pressing a button on the Amulet from "The Galaxy Gift" episode, disappearing and being replaced by Mumy and Harris as an older Will Robinson and Zachary Smith. They attempt one more time to return to Earth but find that they are "Lost in Space ... Forever!"
Who played the robot in the 1998 film lost in space?
Dick Tufeld
Lost in Space
No context provided
Who played the robot in the 2018 TV series lost in space?
Brian Steele
Lost in Space
https://en.wikipedia.org/wiki/Lost%20in%20Space
In 1998, New Line Cinema produced a film adaptation. The 1998 film includes a number of homages to the original television series. These include cameos and story details from the original TV-series, including:

Dick Tufeld as the Robot's voice.
Lost in Space
Brian Steele is an American actor who has had many roles as monsters and creatures on television and in films. In 2018, he appeared as The Robot in Lost in Space.
Brian Steele
Bob May (September 4, 1939 – January 18, 2009)[2][3] was an American actor best remembered for playing The Robot on the television series Lost in Space, which debuted in 1965 and ran until 1968. May appeared in all 83 episodes inside a prop costume built by Bob Stewart; the robot's voice was dubbed by Dick Tufeld, who was also the narrator of the series.[4]
Bob May (actor)
Bob May was an American actor best remembered for playing The Robot on the television series Lost in Space, which debuted in 1965 and ran until 1968. The robot's voice was dubbed by Dick Tufeld, who was also the narrator of the series. In 1998, New Line Cinema produced a film adaptation of Lost in Space in which included the voice of Dick Tufeld for the voice of the robot. In 2018 the television series was remade, using Brian Steele as the robot. 