That's the disco version of the Hulk theme used in the episode "Alice in Discoland" accompanied by footage someone spliced together from the TV series that ran from 1977-82.
Crystal and I have been combing through these episodes and I must report that it is sweeter than ever. Those who claim Mark Ruffalo is the superior David Banner needs to shut their stinkin' pie holes because he's got nothing on the late, great Bill Bixby. Sure, Ruffalo was more palatable than Ed Norton or Eric Banana but Bixby had a distinct charm that cannot be matched. His smile is just so damn disarming.