Doctor Who American 6th Doctor (1984-1986)

The sixth Doctor's regeneration was initially unstable, and he nearly strangled Peri before he came to his senses. Realising what he had nearly done, he initially considered going into a hermit-like existence on the planet Titan 3, only to be caught up in events on the planet Jocanda, after which he resumed his travels (The Twin Dilemma). He encountered many old foes including the Master, Daleks, Cybermen and Sontarans, and even shared an adventure with his own second incarnation in The Two Doctors. He also faced a renegade female Time Lord scientist, the Rani, who was conducting experiments on humans using the Luddite riots as a cover.