The Avengers: Age of Ultron cast is multiplying like tribbles, if you can pardon the cross-series reference.

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South Korean actress Kim Soo-hyun/Claudia Kim has officially joined the Marvel Universe, according to Comic Book Movie. While rumors about Kim's involvement with the Joss Whedon production hit the Internet several months ago, Marvel Studios remained mum on the matter.

Kim took to Twitter on Tuesday to shatter the current radio silence.

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"After a long wait, I'm happy to be back with great news," Kim wrote (translation provided by IGN). "I have a lot to do ahead of me, but for now, the words 'Welcome to the Marvel Universe' are amazing and kind of overwhelming. I was a fan of Marvel Comics, and if you really like something, looks like fate can make it happen."

Unfortunately, it is still unknown who Kim will be portraying in the second Avengers outing.

The Avengers: Age of Ultron will also star Iron Man (Robert Downey Jr.), Hulk (Mark Ruffalo), Captain America (Chris Evans), Black Widow (Scarlett Johansson), Thor (Chris Hemsworth), Quicksilver (Aaron Taylor-Johnson), Scarlett Witch (Elizabeth Olsen), Hawkeye (Jeremy Renner), the Vision (Paul Bettany), Ultron (James Spader), and Baron Wolfgang von Strucker (Thomas Kretschmann).

Click the video below to see a set vide from the film's Hulk-powered action sequence in Johannesburg, South Africa. The Hulk is currently an invisible force that will be added via CGI.

The Avengers: Age of Ultron will hit theaters on May 1, 2015.

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The Avengers 2, Avengers: Age of Ultron, Movies, Marvel