Poor old Davros. He started out by making the Daleks and then he got killed by them at the end of his first story. He was then resurrected so that he could be killed a few more times, for good measure. While he eventually lead an uprising against the Dalek Supreme, he won initially before loosing again, only to be then kept as a prisoner in The Stolen Earth. Whereupon he was blown up due to a scheme by Dalek Caan. It can hardly even be said that the Daleks turned on him, either, since it was basically their first action to kill him. It obviously infuriates them that something different was what created them and theyve been taking revenge as many times as they can ever since. Speaking of which...