Killer Croc (The Batman)

Killer Croc is a half-man, half-reptile who wants to submerge all of Gotham City in water in order to faciliate his plundering of the city. The version of this character is more intelligent as he is capable of thinking clever ideas in order to obtain money.

History
His true origin is unknown, though a brief comment in his first episode implies he may somehow be tied to the military, or trifled with the wrong kind of voodoo in the Bayou (due to his Cajun accent) or like the more well known origins of Killer Croc in the comic series, he was simply born this way and ended up in a Circus freak show. Killer Croc is a virtual powerhouse with the strength of a crocodile (and a tail to boot). Croc is able to chomp and swim his way around Gotham.

After flooding downtown Gotham by backing up the sewage pipes that are used to transfer water out from the city. So it's banks were easy to pillage, Croc was eventually taken down by Batman. Though the battle was lengthly, Batman exploited Croc's weakness for air underwater and half-drowned him, depriving him of oxygen and putting him in an unconsious state. Thus, he was stopped just in time by Batman.

Another time, Killer Croc joins up with Team Penguin, a group of Gotham's villains formed by the Penguin, and his job was to sneak into waterside facilities underwater and take out Security Guards. When the team ends in failure, he is defeated by Batman.