Lost in Space

It's mostly a kids show, so ending was always going to be happy. Basically you find out the robots were created by an insect-like multi armed race. One of the robots initiated a genocide and wiped them all out (that engine they use to travel in space? they basically used it on the planet's surface and the rift in space blew up half the planet, wiping out the aliens). Its big beef with Will Robinson is he views humans, and Will, as new masters trying to take the place of the old alien race and is trying to figure out how they got Robot to change. The main bad robot, SAR, stabs Will in the heart. They eventually get to Alpha Centauri and Will survives and gets an artificial heart, and the killer robots follow, planning to blow it up like they did their alien masters in the past. Penny decides to help a dying/heavily damaged killer robot and it changes to be nice like the main Robot. The whole gender thing is it tries to emulate her like Robot tried to emulate Will and she calls it Sally/projects onto it being a girl, so getting triggered about that is laughable especially considering Penny's character. Will travels to the robot alien new homeworld to try to get them to call off the war. Robot fails to convince them, so he gathers a dying Will and does something with Will's heart that heals Will, but Robot seemingly dies in the process. The other alien robots see this and seem to accept that humans aren't their old alien masters. SAR still wants to kill all humans and goes to stab Will again, but Robot basically uploaded himself or something into the heart, so Robot overwrites SAR and gets resurrected basically. War ends, some of the robots decide to stick around and help the humans rebuild the planet and also make new ships to help bring people there, other robots decide to peace out and do their own thing. Show ends with Will + Robot exploring the galaxy