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The Fourth Doctor underwent his regeneration into the Fifth Doctor after falling from the Pharos Project telescope. (TV: Logopolis) This was the fourth regeneration of the 12-regeneration life cycle beginning with the First Doctor. (TV: The Time of the Doctor)
As Doctor anticipated his death while dangling, his mind flashed memories of the Decayed Master, a Dalek, the Nomad Cyber-Leader, the Captain, Davros, a Sontaran, a Zygon, and the Black Guardian.
After the fall, he saw Sarah Jane Smith, Harry Sullivan, the Brigadier, Leela, K9 and Romana's first and second incarnations. (TV: Logopolis)