Ultraman: Along Came a Spider-Man

On Marvel Earth, Spider-Man joins forces with the Avengers to battle Doctor Doom in New York City, but when several civilians are killed in a building collapse as a result, Spider-Man becomes demoralized and finds himself whisked away in a strange spacecraft called the Interdimensional Train. Doctor Doom stows aboard and both find themselves in the Tokyo of the Ultraman universe! Witnessing Ultraman battle a giant Kaiju, Doom craves the Giant of Light’s power and joins forces with Alien Mefilas and his army of Kaiju from the Monster Graveyard to steal it.

(Source: Tsuburaya Productions)