Marvel Comics Group (in-universe)

Marvel Comics Group published Doctor Who Weekly (PROSE: A Letter from the Doctor) and The Defenders. (TV: The Return of Doctor Mysterio)

When the Fourth Doctor wrote two letters in advance to the readers of Doctor Who Weekly, he suggested that they write in about what they think of the magazine, as well as to include a photo. He supplied the address, Marvel Comics, Jadwin House, 205-211 Kentish Town Road, London, NW5, for the readers to use. (PROSE: A Letter from the Doctor)

The Seventh Doctor once stated that "with great power, comes great responsibility", a quote that he thought came from Marvel Comics. (PROSE: Timewyrm: Genesys)