In the first Avengers movie The Hulk only actually utters one decipherable line of dialogue to a defeated Loki: "Puny God". That line was provided by the actor who played Bruce Banner/Hulk, Mark Ruffalo -- But the various roars and grunts made by the character were courtesy of none other than the original Hulk (in the tv show which ran from 1977-1882), Lou Ferrigno. Now, while at WonderCon, Ferrigo confirmed to Nuke The Fridge that "YES, he will be doing the voice over work for The Hulk" in Joss Whedon's Avengers: Age Of Ultron. The Marvel sequel is set to hit theaters on May 1, 2015
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