Iron Man, Thor, Captain America and other heroes of the Marvel universe have united to send Gazillion Entertainment's Super Hero Squad Online into closed beta. The announcement was made in a press release earlier today and now the call is out for willing beta testers to help put the game through its paces and help bring down Doctor Doom.

The game is based on The Super Hero Squad Show cartoon, which uses a variety of Marvel characters. The game will utilize the free-to-play model when it launches and will be playable right from your browser. You can sign up to help test the game via the Super Hero Squad Online website.