There's a couple boxes for me under the tree already. I know they're just clothes. But that's fine.

It was a fatal dose of blue radiation from the cave of the arachnid Great One on the planet Metebelis 3 that caused the Doctor to change his form once more. The Doctor had to face his fear and in doing so sacrificed his life for the oppressed people of Metebelis. Thanks to the timely assistance of another Time Lord, K'anpo, the Doctor regenerated once more and was soon to break his ties with UNIT and the Earth and once more become a traveller in time and space.