Alright to start us off, I'll do several story lines of my own:
Story one: The pet avengers and the raccoon - The pet avengers have a very memorable encounter with Rocket raccoon which begins a long and lasting friendship, of sorts. Until the Raccoon decides to make better use of the avengers as belly fodder, than companions.
Story two: a pet avenger unleashed - the often maligned supercat Hairball decides to strike out on his own. But first he'll need to get rid of some, or all, of his teammates in the best way a cat can. X3 if they won't show him respect, he'll make sure they pay...
Story three: Dex-starr kills the pet avengers - DC's very own super powered animal, the red lantern kitty Dex-starr, finds himself in the marvel universe. And he's none too pleased or impressed at what he finds there. A team of soft, innocent super animals, they fill him with such rage. There's only one solution to that...
Story four: In the belly of the beast - An alternate ending to issue #3 of the original series, which saw the pets end up in the belly of the giant whale Monstro. But this time, they will not escape.