A true danger to all heroes is the Inevitable Hulk that makes all other hulks cringe. Be warned that a hero could be easily destroyed by his power and it is inevitable that a Hero will meet and have to fight with him at some stage in his career.
How did this situation come to pass? Alas, dear Reader, we can only speculate. The obvious step of asking the Monster is out of the question as to the chance of fatal consequences as a result of getting close enough to ask is depressingly high.
It is known that at one stage, he was pretty much your standard Hulk, having gone down the usual route of getting too close to highly unstable radioactive doodahs, in the pursuit of scientific knowledge. As such, he might have been expected to pursue the normal career path for a Hulk except for one thing; at the time of his, um, transition to Hulkhood, Time itself was going through one of its less stable periods and the resulting period of extreme confusion saw him stuck in a Time Loop, fated to challenge Heroes for the foreseeable future, at least.
Inevitably, after an initial period of success and from his point of view, even fun, the novelty wore off as for Hulks, as indeed for anyone else, you can have enough Heroes and as far as he is concerned, he has had more than his share already. This gives an added edge to his attacks and this is added to by the fact that the only relief from this not-so-merry-go-round comes if he actually kills one. When this happens, the Time Loop slows down for a while, allowing him to sneak back to town, chill us and drink Beer, of which he has become very fond.
Of course, he is not liked in town, on account of his Hulking appearance and general, well, greenness but he is tolerated by bartenders at least as he is pretty much always flush with looted Gold.