SPOILER WARNING: This article contains spoilers for tonight's episode of "The Flash," "The Fury of Firestorm."

As teased earlier today, a truly ferocious metahuman, who fans know most recently from the "Suicide Squad" comic, made his first appearance on tonight's episode of "The Flash."

That's right, courtesy of Professor Zoom, at the end of tonight's visual effects-filled and Firestorm-packed episode, we caught a glimpse of classic DC Comics villain King Shark!

In the episode, Det. Patty Spivot had Barry Allen run tests for a possible new metahuman on in Central CIty. Allen was sure to dismiss anything fishy -- that is, until the last moment of the episode, when King Shark made his thrashing debut in Central City.

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During a recent press event, "The Flash" producer Andrew Kreisberg discussed the villain's brief-but-impressive appearance.

"We actually put him in the comic book adaptation because we said, "No one is ever going to let us do this and we're never going to be able to do this" since we weren't going to be using the Squad anymore. We were talking about it and it was really Todd Helbing who was like, "Let's do it!" It was a very expensive 30 seconds of the show but our visual effects team are the best and they love challenges like this.

"It was just fun for us. Obviously we can't afford to do an entire King Shark episode so the idea was that he was one of Zoom's minions and just the latest in the line. Which does mean that there is a King Shark on Earth-1."

As for King Shark's attempt on the Flash's's life, well, let's just say it's lucky for him that the Earth-2 version of Harrison Wells showed up just in time to subdue the villain with a weapon he built using materials he stole earlier in the episode from Mercury Labs.