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Tony Stark warns the Avengers of an Ultron assault in a new clip from this week's "Marvel's Avengers Assemble," airing Sunday at 8:30 AM ET on Disney XD!

"Crack in the System" Clip 1

Tony Stark warns the Avengers of an Ultron assault in a new clip from this week's "Marvel's Avengers Assemble," airing Sunday at 8:30 AM ET on Disney XD!

Tony Stark warns the Avengers of an Ultron assault in a new clip from this week's "Marvel's Avengers Assemble," airing Sunday at 8:30 AM ET on Disney XD!

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