Get a look at Sunday's new "Marvel's Avengers Assemble" with a clip and our behind-the-scenes interview with Liam O'Brien, the voice of the Red Skull, directly below! Iron Man and Captain America infiltrate the Skull's Cabal as the Grim Reaper and Crossbones...but what happens when the villain's discover their ruse?
Then, scroll down even further for a look at "Marvel's Hulk and the Agents of S.M.A.S.H." as Hulk and the Thing take on a three-headed snake monster in the Negative Zone!
Don't miss all the action beginning at 8:00 a.m. ET inside Marvel Universe on Disney XD this Sunday!