Peter Davison (Earth-33⅓)

Peter Davison played the Fifth Doctor. In 1981, he auditioned for the part and later got the role.

History
At his audition, (NOTVALID: Ever Wondered What Happened At.. The Auditions For The Seven Doctors?) he delivered a Dalek baby, proclaiming "It's a boy!". This led John Nathan-Turner to comment his opinion that Davison would make an excellent Doctor as soon as they got him off of his veterinarian kick. (NOTVALID: Untitled 6, Ever Wondered What Happened At.. The Auditions For The Seven Doctors?)

While fiilming Doctor Who, Davison was inconvenienced by the "special effect" for a toxic alien atmosphere, which was nothing more than a man blowing on a tobacco pipe to produce noxious smoke. (NOTVALID: Some BBC Special Effects That Weren't So Special)

A Doctor Who fan once asked Peter Davison (in-costume as the Fifth Doctor) for "Tom Baker's autograph". (NOTVALID: Introduction)

In 1984, he was suceeded in the role by Colin Baker. (NOTVALID: Ever Wondered What Happened At.. The Auditions For The Seven Doctors?)

Behind the scenes
Peter Davison first appeared in the comical comic works of Dicky Howett and Tim Quinn in It's Bigger on the Inside! in two distinct comic stories, Some BBC Special Effects That Weren't So Special (comic story) and the 6th untitled comic in the book. In the former, he was unnamed, but it was clear from the wholly real-world-focused (though still comedic) context that the individual depicted was Peter Davison rather than the actual Fifth Doctor.

Less than a month later, Davison reappeared outside the pages of It's Bigger on the Inside! as part of Ever Wondered What Happened At.. The Auditions For The Seven Doctors?. His appearances in the untitled story and Ever Wondered were almost identical, with the latter story only adding the caption "1981" and recontextualising the event as part of his audition process.