Blockbuster #4 was published by Marvel UK/Panini UK on September 1, 1981, as part of a series that began in 1981. Chris Claremont and Doug Moench write, and art comes from George Pérez, Gil Kane and Jim Mooney. It features Iron Man, Iron Fist, Medusa, Black Bolt and Crystal, among 22 characters cataloged on VerseDB.