chunk: The Robinsons are often placed in danger by Smith, whose self-centered actions and laziness endanger the family on many occasions. After the first half of the first season Smith's role assumes a less evil overtone although he continues to display many character defects. In "The Time Merchant" Smith shows he actually does care about the Robinsons after he travels back in time to the day of the Jupiter 2 launch with the hope of changing his fate by not boarding the ship and allowing the Robinsons start their mission as originally planned. However, once he learns that without his weight altering the ship's course the Jupiter 2 would be destroyed by an uncharted asteroid, he sacrifices his chance to stay on his beloved Earth by electing to re-board the ship, thus saving the lives of those he really does care about and continuing his position amongst them as a reluctant stowaway.