Keith escaped to Earth, wanting to be accepted. He finally is but is soon forced to return to space. Having to give up what he longed for, he must protect the universe from the very place he once longed to get away from.
*Editing Soon*
After the battle with Zarkon Keith disappears and is assumed to be dead by the team. A month later they come across a mysterious ship floating near a wormwhole. Inside they find Keith, but not their Keith. This Keith is Altean from an alternate reality where he was the protector of his Prince, Lance.