Mighty Marvel Comicon 1975

Mighty Marvel Comicon 1975 was an event for which a young Grant Gordon owned a poster, which was kept on his bedroom wall, above his bed.

Said poster featured several Marvel characters, including Daredevil, Iron Man, the Silver Surfer, Thor, Doctor Strange, Spider-Man, the Human Torch, Mister Fantastic, the Invisible Woman, the Thing, Scarlet Witch, Captain America, the Hulk, and Doctor Doom, along with several others. (TV: )

Behind the scenes
Several characters in the poster had been seen or mentioned in other Doctor Who universe fiction, whether as real individuals or as fictional characters, but some of them have not, such as Vision.