Omega reveals the purpose behind bringing the Doctor to his antimatter world, but the Doctor(s) discover a startling fact about Omega that he didn't know himself and eventually strike a bargain.
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The footsteps of those returning to Earth via Omega's light stream can be heard after they have disappeared. See more
If you both stay here willingly and share my exile, then I will spare your friends and their universe.
We shall give you that promise, Omega.