All Star Superman (2006)

The Superman story to hand anyone who thinks Superman is boring. Grant Morrison and Frank Quitely's twelve issues stand completely outside continuity: Superman learns he is dying and uses the time he has left to do every impossible, generous thing he can. It is a love letter to the Silver Age Superman, full of oddball ideas from old comics played completely straight, so a reader with long memories catches twice as much. It has been reprinted constantly since, including in a pocket-sized edition, and needs nothing else on the shelf beside it.