Author’s note: I first wrote up this wee bit of allohistorical silliness in March of this year, posting it a few places online, but never actually bothered on my own website until now. Enjoy.
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								Doctor Who?, on CBS
								
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										1963–1966: Vincent Price (Doctor Who) 
First episode: “The Girl from Another World”
Last episode: “Planet of the Daleks” - 
										1966–1967: Jack Nicholson (Doctor Who, Theta Sigma) 
First episode: “Planet of the Daleks” 
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										1963–1966: Vincent Price (Doctor Who) 
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								Doctor Who and the Daleks, on CBS
								
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										1967–1972: Jack Nicholson (Doctor Who, Theta Sigma) 
Last episode: “The Paradox Web” 
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										1967–1972: Jack Nicholson (Doctor Who, Theta Sigma) 
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								Doctor Who: Alien Agent, on CBS
								
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										1973–1975: David McCallum (Agent John Smith / Doctor Who, Theta Tau) 
First episode: “The Mannequin Men”
Last episode: “Doctor Who’s Mind” 
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										1973–1975: David McCallum (Agent John Smith / Doctor Who, Theta Tau) 
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								Doctor Who and the Cyber-Man, produced by New World Pictures
								
- 1980: Clu Gulager (Doctor Who / “That existed?”)
 
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								Doctor Who, on UPN
								
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										1986–1989: Kyle MacLachlan (The Doctor) 
First episode: “Pilot”
Last episode: “The Deadly Assassin (Part 1)” - 
										1990–1993: Bruce Campbell (The Second Doctor) 
First episode: “The Deadly Assassin (Part 2)”
Last episode: “The Edge of Time” - 
										1994–1998: John Rhys-Davies (The Third Doctor / The Professor) 
First episode: “For Want of a Nail”
Last episode: “Seta (Part 2)” - 
										1999–2002: Kate Mulgrew (The Fourth Doctor) 
First episode: “Changes”
Last episode: “Hourglass” 
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										1986–1989: Kyle MacLachlan (The Doctor) 
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								Doctor Who, on NBC
								
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										2005–2011: Neil Patrick Harris (The Fifth Doctor) 
First episode: “The Interstellar Interruption”
Last episode: “Paradise Lost” - 
										2012–2013: Donald Glover (The Sixth Doctor) 
First episode: “…We Have a Problem” 
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										2005–2011: Neil Patrick Harris (The Fifth Doctor) 
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								Doctor Who, on Blockbuster
								
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										2014–2015: Donald Glover (The Sixth Doctor) 
Last episode: “The Three Doctors” - 
										2015–2019: Nathan Fillion (The Seventh Doctor) 
First episode: “The Three Doctors”
Last episode: “World Enough and Time (Part 5)” - 
										2019–2023: Daniel Dae Kim (The Eighth Doctor) 
First episode: “Grandfather Clock”
Last episode: “1963” 
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										2014–2015: Donald Glover (The Sixth Doctor) 
 
Season 26 of Doctor Who is slated for a release in the late summer of 2024, starring Matt Smith of TCM’s A Song of Ice and Fire.
Actors who played the Master include…
- James Shigeta as “the Celestial Master”, a one-shot villain from the Price era who would reoccur as a trickster figure in army fatigues in Doctor Who and the Daleks
 - Robert Z’Dar as “the Master of Time”, a larger-than-life egomaniac who forced MacLachlan’s Doctor’s regeneration and would regularly clash with him in the “actionised” Campbell years
 - John Anderson as “Mr. Seta”, a master (heh) of disguise who was written as a throwback to the Alien Agent era
 - Christopher Walken as “Professor Tannhauser”, who, in the far future, devises an equation proving humanity can escape the end of the universe — a plan that NPH’s Fifth Doctor gladly assists in, until one of them realises just who the other is…
 - Lady Gaga as “Claire Oswald”, a companion throughout the first season of the Fillion era who always seems to know a bit more than she lets on