Twelfth Master's regeneration
From Tardis Wiki, the free Doctor Who reference
This topic might have a better name.
the title of this page seems to assume we cover Delgado at "Twelfth Master", but he is at The Master (Terror of the Autons). A discussion on his name is currently taking place at Talk:The Master (Terror of the Autons), however
Talk about it here.
All life will obey me!
Following his twelfth regeneration, the Decayed Master sought to survive beyond the end of his initial regeneration cycle. (TV: The Deadly Assassin) Shortly before he successfully possessed the body of Tremas, the Master claimed to be nearing "the end of [his] twelfth regeneration", (TV: The Keeper of Traken) which was later reiterated by the Fourth Doctor. (TV: Logopolis)