A major theme of the finale is "trust," specifically the belief that alien robots can be freed from their rigid programming through acts of compassion.
: Upon returning to Alpha Centauri, Will confronts SAR. SAR attempts to kill Will by stabbing him in the heart once more. However, this was a calculated move: Robot had transferred its consciousness/data into Will’s artificial heart. Lost in Space - Season 3Eps8
: Following Penny’s example, other children in the colony show kindness to damaged robots, successfully converting a group of them to fight alongside the humans against SAR. The Final Showdown: Will vs. SAR A major theme of the finale is "trust,"