Fifteen years after his daring raid turned the tide of an extraterrestrial invasion of the Earth, Col. John Robinson is retired from active service with grand ceremony. Hoping to repair damaged relationships with his estranged family, he volunteers them to take part in a multi-family colonization project bound for a newly-discovered star system. En route, the massive mothership is attacked by the same aliens he defeated so many years before. As alien forces board the ship, John and pilot Major Don West detach the Robinsons’ landing pod and escape with the family through a nearby wormhole, becoming lost in space.