AceShowbiz -

A clip for "Avengers: Age of Ultron" is released at the MTV Movie Awards, showing a fight between Bruce Banner in his Hulk form and Tony Stark in his Hulkbuster gear. The new sneak peek video reveals what triggered the feud between the two Avengers.

Introduced by Robert Downey Jr., it shows that the giant hero is manipulated by Scarlet Witch who is played by Elizabeth Olsen. "That little witch is just messing with your mind. You're better than her; you're stronger than her. You're Bruce Banner," Stark says.

Downey Jr. was also at the awards to receive Generation Award presented by his co-stars. "I've grown up, I've struggled, I've failed, I've succeeded, I've partied way too much, I've squandered, resisted, repented," he recalled his dark past. "I've tried to live honorably and never forget my love of the game or my friends."

Directed by Joss Whedon, "Avengers: Age of Ultron" is due May 1 in the U.S. Robert Downey Jr. returns as Iron Man, Chris Evans as Captain America, Chris Hemsworth as Thor, Mark Ruffalo as Hulk, Scarlett Johansson as Black Widow, Jeremy Renner as Hawkeye, and Samuel L. Jackson as Nick Fury. Aaron Johnson is added as Quicksilver, James Spader as Ultron, and Josh Brolin as Thanos.