After his fall in Logopolis the fifth Doctor vowed never to waste another regeneration due to the pull of a gravity well. He thus flew the Tardis to a sufficiently advanced medical facility and infused his timelord DNA with anti-gravity-wavity-stuff. His DNA passes to each new regeneration.
Works for me.
And the Master didn't seem to have much respect for gravity in the first installment...
Works for me.
And the Master didn't seem to have much respect for gravity in the first installment...