Robin, Starfire, Cyborg, Raven, and Beast Boy are at the tower, having returned from their fight in Tokyo. As they are lounging around, Robin suggests that they add a sixth team member permanently.

Robin: “I think a sixth teammate would be beneficial for us. We’ve faced so many threats that it might be important for us to have another member to help us out with those kinds of events.”

Beast Boy: “We had one before. She’s turned to stone now.” He’s referring to Terra.