From the 60's-80's
BBC TV sci-fi series
Doctor Who.
A fictional race of aliens from Gallifrey who discovered time travel. They try to police history.
They include the good rebel "The Doctor" (Doctor Who), the evil rebel "The Master" and the inventor of the Tardis "Rassilon".
Time Lords can regenerate 11 times (or 13 in some episodes), so when they die they can create a new body. They also have superhuman strength and two hearts.