Mawdryn and his fellow immortals - stuck in ceaseless cycles of mutation and deterioration - are quite determined on the Doctor sacrificing his future for their sakes, giving him the choice between helping them or stranding Teagan and Nyssa with them on their infinite journey. The Doctor, however, seeks a third option.
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I've got to program a temporal deviation to escape the warp ellipse.
Brigadier Alistair Gordon Lethbridge Stewart
We stuck on this ship?
I wonder... if I reverse the polarity of the neutron flow...
Referenced in Talking About Regeneration