Marvel Team-Up #13 is a vintage US comic book from 1973 featuring Spider-Man and Captain America versus the Grey Gargoyle. The comic is a single issue in color format and is boarded. The story, titled "The Granite Sky," was written by Len Wein and illustrated by Gil Kane & John Romita Sr. Kane created the cover art. The comic was published by Marvel Comics and is part of the Marvel Team-Up series. It is intended for a general audience and is set in the Marvel Cinematic Universe.