Don West is a fictional male Human in the Lost in Space series. The character was portrayed on screen by Ignacio Serricchio. His allegiance / loyalty is to The Robinson Family. The role in the 1998 movie of the same name was played by Matt Le Blanc, of Joey from Friends fame.
We don't see Don West until the second episode. Don is with an unknown female but not his wife as he mentions. He escapes from the exploding space craft with Dr. Smith and another female. The female dies when they land on the planet.
Don has a close attachment to a chicken that he saved and has in his bag. When Dr. Smith and Don come across an unconscious female, Dr. Smith persuades Don to help the woman. Don frees the woman and carries her.
Dr. Smith would later betray Don West and steal the remaining flares that they had recovered earlier. Don stayed with the injured woman instead of chasing after Dr. Smith.