I'm beginning to think that people should just stop making superhero cartoons until they learn how to keep them airing for at least three seasons and/or 65 episodes.
A memorial to all the superhero shows I've seen that were cancelled before their time:
***SPOILER*** Legion of Super Heroes (2 seasons)
Wolverine and the X-Men (1 season)
Young Justice (2 seasons)
Green Lantern (1 season)
The Spectacular Spider-Man (2 seasons)
Avengers: Earths Mightiest Heroes (2 seasons)
Iron Man: Armored Adventures (2 seasons)
Spider-Man Unlimited (1 season, and a cliffhanger to boot)
Fantastic Four - 2006 (1 or 2 seasons depending on who you ask)
Seriously though, I would have liked to see what they might have done with the Guardians harnessing the green energy for themselves again.