Lost in Space is an American science fiction television series created and produced by Irwin Allen. The series follows the adventures of a pioneering family of space colonists who struggle to survive in a strange and often hostile universe after their ship is sabotaged and thrown off course. The show ran for three seasons, with 83 episodes airing between 1965 and 1968. The first season was filmed in black and white, with the second and third seasons filmed in color.

Answer this question: when did the first lost in space come out? Let's give stream of consciousness first:
This is the relevant information: The show ran for three seasons, with 83 episodes airing between 1965 and 1968.
So, the final answer is 1965.