Invincible #31 was published by Image Comics on April 1, 2006, as part of a series that began in 2003. Robert Kirkman writes, and art comes from Bill Crabtree, Cliff Rathburn and Deena Simmons. This 32-page issue features Invincible, Atom Eve, Robot, Deborah Grayson and Monster Girl, among 22 characters cataloged on VerseDB.