Killer Croc, a character often associated with villainy, proved that he can be a hero by laying down his life to save Gotham City in Suicide Squad #26 during the Dark Knights: Metal event.

That was when it attacked.' Police sergeant Garry Casey took up the story: 'The croc grabbed the 22-year-old by the shoulder and he disappeared under the water. It was about 5pm on Sunday.

Considering that Gotham City is inhabited by superhuman musclemen like Bane and Killer Croc, a geeky psychiatrist like Scarecrow may not appear like the biggest threat in hand-to-hand combat.