Warning: Major spoilers ahead for tonight's episode of The Flash.
Tonight saw the first appearance of DC Comics villain King Shark on The Flash.
Well, at least in live action; by the time he appears here, he'd already been in the The Flash Season Zero comic. But this is the Earth-2 version, sent by Zoom and stopped by -- ironically -- Harrison Wells.
He's a humanoid shark-man. In the pre-Flashpoint continuity he resembled a Great White, but more recently he's been depicted as a mutated hammerhead shark. Originally a Superboy villain, he was implied to have been descended from the Wild Men of Kamandi fame (his creator, Karl Kesel, was a big Jack Kirby fan). He would later go on to trouble everyone from Jimmy Olsen to Aquaman, and has served stints in the Suicide Squad and Secret Six. King Shark was rumored to be one of the characters in the Suicide Squad movie for a time.