Board Thread:Questions and Answers/@comment-17746216-20140316133045/@comment-4586893-20140316142528

The truth is, Spaner is Robin and in the end of the episode, "Animo Crackers" he travels to Gotham. Derrick has hinted at a Batman/Ben 10 crossover for a while now and this is the ultimate spoiler. However, Rook is set to die and Gwen and Kevin come back on. Batman joins the team with Robin and they all beat up Vilgax and live happily ever after.