(W) Gerry Conway (CA) Patrick Gleason, Mick Gray Known for his brutal strength and hot temper, Killer Croc has been one of Batman's most physically formidable foes. Born with epidermolytic hyperkeratosis, a medical condition causing Killer Croc's skin to harden and appear lizard-like, Croc has learned to embrace his destiny as a creature of Gotham's seedy underbelly. This new title collects some of Killer Croc's greatest stories.