When Dick tells the rest of the Titans that the Red Hood is Jason, Hank asks: "Is this some kind of voodoo act to raise the dead?" and Dove asks Dick about Ra's Al Ghul's whereabouts. In the Batman series "Under the Hood", from which the series draws its inspiration, Ra's Al Ghul indeed resurrects Jason Todd using a Lazarus Pit: a mystical pool which can raise the dead.