10 Doctor Who Moments Deeper Than You Think
1. Floor 507
In The Doctor Falls, the Twelfth Doctor makes his last stand on Floor 507 of the colony ship besieged by Cybermen. This ship is absolutely huge, so surely Floor 507 was a random number selected by writer Steven Moffat, right?
Wrong.
Moffat once stated that every writer has a specific number they fall back on when they need to exaggerate something. Being very familiar with the work of his predecessor Russell T Davies, Moffat identified that RTD's favorite exaggeration number was 57.
He's not wrong either. In Army of Ghosts, the Tenth Doctor pretends that Jackie Tyler is actually Rose, saying that she aged 57 years after staring into the time vortex - and that's just one of several uses of the number 57 in RTD's Doctor Who.
Moffat admitted that Floor 507 was a tribute to RTD's love of that number, but this wasn't the first time he'd used it in a Twelfth Doctor adventure. Page 57 was used in Last Christmas to convince the inhabitants of the North Pole base that they were still dreaming.
Deeper still, 507 is the number that the Eleventh Doctor gave Clyde Langer in The Sarah Jane Adventures, when asked how many times a Time Lord could regenerate. So, Floor 507 was an appropriate location for the Twelfth Doctor's apparent death.