Flex Mentallo is a four issue miniseries written by Grant Morrison and drawn by Frank Quitely.
The series is based on a character from Morrison's previous work on Doom Patrol but is considerably different in terms of themes and subtext. Whereas Morrison's run on Doom Patrol was a work of Surrealism, the Flex Mentallo miniseries is Metafictional.
Both styles are examples of Nonlinear narrative.
Collected in Flex Mentallo: Man of Muscle Mystery- The Deluxe Edition.