Doctor Doom

Doctor Doom once attended Bonjaxx's birthday party at Maruthea. (COMIC: The Incomplete Death's Head)

The Twelfth Doctor recalled knowing a man named Von Doom. He described him as a "humourless guy" and a "tin-pot". (COMIC: Clara Oswald and the School of Death)

Behind the scenes
In Marvel Comics, Doctor Doom (Victor von Doom) is the archnemesis of the Fantastic Four. Curiously, he is seen with Fantastic Four members the Thing and the Human Torch at Bonjaxx's birthday party.