The Avengers had sounds from the original Hulk TV show!
The old Hulk TV series is one of those iconic shows that has stood the test of time in pop culture consciousness. Seeing Lou Ferrigno painted green kicking ass is still remembered and parodied.
Turns out, even though we can’t see Lou Ferrigno kick ass, we can hear him doing it still. When the sound designer of the 2009 Avengers movie were trying to come up with the perfect roar for the Hulk, they tried a mix of animals.
The director of the movie kept saying that the Hulk sounded too much like a monster and he wanted a human element in the roar. In the end, the sound designer decided to include a combination of Mark Ruffalo (who played The Hulk), Lou Ferrigno and a couple of other people in the final mix for the Hulk!