IRON MAN Hulkbuster Suit vs. HULK Fight Teased in AVENGERS: AGE OF ULTRON by Downey Jr. and Ruffalo

More and more things are being teased about Avengers: Age of Ultron to get the hype machine rolling for its 2015 release.

One of the things being teased is a scene when Tony Stark dons one of his most famous comic book armors, the Hulkbuster suit, and faces off against the Hulk. This has been teased with concept art and with the reveal of a giant prop at Marvel's booth during Comic-Con 2014.

The "Science Bros." are best friends forever but while Stark and Bruce Banner were last seen geeking out together in The Avengers, their hero personas will fight in the sequel. Actors Robert Downey Jr. and Mark Ruffalo spoke to about this eagerly anticipated fight sequence.

"I think it's a moment we've all been dying to see, and getting it right is a big deal," Ruffalo said to HitFix. "There's been a lot of work going into it. I've been shooting motion capture on it for months. And we keep coming back, you know, doing it in little pieces. But it's a Hulk that we've never seen. It's a Hulk on top of a Hulk. It's the Hulk Hulking out."

Downey Jr. had a follow-up comment.

"It can't just be a good fight, it's gotta be about something," Downey Jr. said to HitFix at Comic-Con. "And the great thing in 'Age of Ultron' is, that fight between [Hulk and Stark] is, nobody wins when two people who are friends fight."

In what should be one of the most memorable scenes in Avengers: Age of Ultron, its actors are not revealing much about the sequence (for now). This is only the beginning of many more teases between now and May for this epic battle.

Avengers: Age of Ultron is set to release in theaters on May 1, 2015.