User blog comment:Thailog/New trailer for Season 2/@comment-24.170.58.202-20120423011053/@comment-4026406-20120423011748

I think the Invasion team could be a second team or a team from an Alternate Earth (It's possible with DC). If it isn't the alternate earth theory, the second Team's Robin could be a different person, someone like Tim Drake or Jason Todd.

Another theory is that the Invasion team we've seen is from the future. Beast Boy was 8 in the first season, and (at least, to me) he doesn't look that young in the second season.