Mark RuffaloIt's official: 'Kids are All Right' co-star Mark Ruffalo will play The Hulk in Marvel's highly anticipated 'Avengers' movie, in theaters May 4, 2012.

The news was announced during tonight's Marvel panel at San Diego Comic-Con, along with confirmation that Oscar-nominated actor Jeremy Renner will play Hawkeye. The entire cast was brought out on stage to great fanfare following scheduled 'Captain America' and 'Thor' panels.

In addition to Ruffalo and Renner, the full 'Avengers' cast now comprises Robert Downey Jr. (Iron Man), Scarlett Johansson (Black Widow), Samuel L. Jackson (Nick Fury), Clark Gregg (Agent Phil Coulson), Chris Hemsworth (Thor) and Chris Evans (Captain America). Joss Whedon, who came onto the stage last, will direct.

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Full 'Avengers' Cast Reveal

The role of the Hulk has been at the center of discussion since it was announced that Edward Norton, who starred in 2008's 'The Incredible Hulk,' would not reprise the role in 'The Avengers.' Ruffalo's name has been attached to the project since July 14, and was said to have officially signed on as of yesterday, according to Deadline. Mark RuffaloIt's official: 'Kids are All Right' co-star Mark Ruffalo will play Bruce Banner, aka The Hulk, in Marvel's highly anticipated 'Avengers' movie, in theaters May 4, 2012.

The news was announced during tonight's Marvel panel at San Diego Comic-Con, along with confirmation that Oscar-nominated actor Jeremy Renner will play Hawkeye. The entire cast was brought out on stage to great fanfare following scheduled 'Captain America' and 'Thor' panels.

In addition to Ruffalo and Renner, the full 'Avengers' cast now comprises Robert Downey Jr. (Iron Man), Scarlett Johansson (Black Widow), Samuel L. Jackson (Nick Fury), Clark Gregg (Agent Phil Coulson), Chris Hemsworth (Thor) and Chris Evans (Captain America). Joss Whedon, who came onto the stage last, will direct.

Related Links:
Full 'Avengers' Cast Reveal

The role of the Hulk has been at the center of discussion since it was announced that Edward Norton, who starred in 2008's 'The Incredible Hulk,' would not reprise the role in 'The Avengers.' Ruffalo's name has been attached to the project since July 14, and was said to have officially signed on as of yesterday, according to Deadline.

Ruffalo is mostly known his work in dramas like this year's 'Shutter Island' and his breakout role in the 2000 Oscar-nominated indie 'You Can Count on Me.' His current movie, 'The Kids are All Right,' is now playing in select theaters.

'The Avengers,' which is expected to hit theaters on May 4, 2012, will be directed by Joss Whedon, and will feature a number of superhero stars, from Robert Downey, Jr. ('Iron Man') to Chris Evans ('Captain America: The First Avenger').

In the meantime, keep your eye on Cinematical's Comic-Con coverage for on-the-ground blogging of all the news coming out of San Diego

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Reporting by Patricia Chui