Things are only heating up on Cartoon Network’sYoung Justice, as series producers Greg Weisman and Brandon Vietti lay down the groundwork for the season two twenty-episode story arc “Invasion.” That storyline will have the team as well as numerous other DC heroes and villains involved (approximately 120 of them, in fact) as Earth is threatened by several alien species. The network has released a three minute clip that includes highlights from recent episodes, with a glimpse ahead to more of season one and, especially, “Invasion.”