The Fifth Doctor regenerates

Tags: Fifth Doctor, Peri Brown, Sixth Doctor

The Caves of Androzani, episode 4
16 March 1984

The Doctor and Peri have both been a fatally poisoned and have become mixed up in a drug-war on Androzani Minor. As the planet erupts in molten mud around them and with only enough antidote to save Peri, the dying Doctor collapses to the TARDIS floor...