He was surprise revealed as a new character for theAnthony Mackie-led film that wasadded through reshoots.

But it was only on the Hall H stage atComic-Conin San Diego Saturday that his character was officially revealed.

“Can I say it?

Split photo of Giancarlo Esposito at San Diego Comic-Con and Marvel Comics Sidewinder

Giancarlo Esposito reveals his ‘Captain America: Brave New World’ villain to be Sidewinder of Marvel Comics.Getty; Marvel

I can finally unleash it.

I am the King of the Serpent Society.

I am Sidewinder!”

Giancarlo Esposito, Captain Marvel Brave New World

Giancarlo Esposito as Sidewinder in ‘Captain America: Brave New World’.Marvel

Esposito declared before an energized crowd of fans.

The figure isn’t a household name among mainstream audiences not well versed in the lore of Marvel Comics.

So who is Sidewinder?

What are his aims?

How is he different in the context of the Marvel Cinematic Universe?

Who is Sidewinder?

His real name is Seth Voelker, who was dismissed from his old position as a college professor.

The president of Roxxon gave Seth leadership of the Serpent Squad, a villain group of snake-themed characters.

Seth took the name Sidewinder, with his special cloak that allowed him to teleport.

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“We had this great idea becauseCivil War’s first up, right?

Who is the Sidewinder of the MCU?

But the actor gives a little tease of the role beyond the look to EW.

“He came to this in a different way, which hopefully will unfold.

Sidewinder, however, is not so much that.

“I like Sidewinder because he’s a physical guy,” Esposito continues.

Watch the full interview with the cast ofCaptain America: Brave New Worldin the video above.