Over the course of the story, Gar becomes injured and has to receive a blood transfusion. From Miss Martian. The pretense here is that Miss Martian can shapeshift at the cellular level, so her blood cells could shapeshift to match Gar's. Long story short, that sets everything up for Garfield Logan to return as the Changelin- er, Beast Boy.
The second season of Young Justice is given the subtitle of Invasion and propels the storyline forward five years. With that advancement in the story, there is also a change in lineups, with the Young Justice team now including Lagoon Boy, Blue (Jaime Reyes) Beetle, Batgirl, Wonder (Cassie Sandsmark) Girl, Bumblebee and a new Robin (Tim Drake). Oh! And Beast Boy.
From Phil Bourassa's Deviantart page, I found this image, of Beast Boy in full-on Beast Mode (apologies to both Phil and Marshawn Lynch).
|Beast Boy joins the Young Justice team for the second season of Young Justice.|