A key issue noted for First appearance of Kid Omni-Man (Oliver Grayson) and Debut of Invincible's (Mark Grayson) Blue Suit. Invincible #51 was published by Image Comics on July 1, 2008, as part of a series that began in 2003. Phil Hester and Robert Kirkman write, and art comes from Andy Kuhn, Bill Crabtree and FCO Plascencia. This 32-page issue features Invincible, Atom Eve, Robot, Cecil Stedman and Deborah Grayson, among 25 characters cataloged on VerseDB.