On Monday night in two different series, "The Incredible Hulk" as a comic book was cited. On 'Heroes', Micah made reference to it when talking about his late mother's super-strength to Tracy, a woman who looked just like Nikki/Jessica. And the guys on 'The Big Bang Theory' thought that any possible relationship between Sheldon and Penny would be like some bizarre comics crossover - like the Hulk dating Peppermint Patty, for instance.
Within the reality of Toobworld, this comic book about the Hulk must have come out after the "real" Hulk was first created by David Banner's exposure to gamma rays. In the years since the TV show and its sequel movies have gone off the air, the truth about the Hulk have become public knowledge. And since there have been no reports of him still out there on the rampage being mentioned on any other TV show, it could be that either David Banner finally found the cure for his condition, or he's been imprisoned all of this time, or that he's dead.
One of the results of the Hulk's identity becoming known would be this comic book series mentioned by Micah and the 'Big Bang' nerds. The facts of the story appear to have been altered, however, as the Hulk's alter-ego is referred to as Bruce Banner. David Banner's middle name was Bruce.
If it turns out a TV reference from some show prior to 'The Incredible Hulk' ever turns up, then I'll have to do the Splainin Dance again to adjust the discrepancy.