Robin

Commissioner Gordon: It could be any one of them... But which one? Which ones? 
Batman: Pretty *fishy* what happened to me on that ladder... 
Commissioner Gordon: You mean where there's a fish there could be a Penguin? 
Robin: But wait! It happened at sea... Sea. C for Catwoman! 
Batman: Yet, an exploding shark *was* pulling my leg... 
Commissioner Gordon: The Joker! 
Chief O'Hara: All adds up to a sinister riddle... Riddle-R. Riddler! 
Commissioner Gordon: A thought strikes me... So dreadful I scarcely dare give it utterance... 
Batman: The four of them... Their forces combined... 
Robin: Holy nightmare!