Doctor Who: 10 Easter Eggs, In-Jokes And References In The Magician's Apprentice
6. Three Possible Versions Of Atlantis
To find where the Doctor is hiding, UNIT track his visits to Earth throughout history to pinpoint his current location. As such, this was a prime place to add in a few mentions of previous Doctor Who stories to get fans salivating.
Name-checks include San Martino, the setting of The Masque Of Mandragora, Troy, which the First Doctor visited in The Myth Makers, and multiple visits to New York, which we saw in The Chase, Evolution Of The Daleks and The Angels Take Manhattan. Most interestingly, though, there is a mention of three possible versions of Atlantis.
This is a nod to an obscure piece of Doctor Who trivia. Throughout the show there have been three contradictory accounts of Atlantis' destruction - The Second Doctor did it to save the world in The Underwater Menace, Azal claims to have done so in The Daemons and The Master did it yet again in The Time Monster.