Teen Titans (2003)

S1E1 Final Exam

Fresh from their graduation at H.I.V.E. Academy, Gizmo, Jinx, and Mammoth are recruited by Slade to launch a surprise attack on the Titans. As the Titans attempt to thwart their plans, chaos ensues, and Robin goes missing amidst the battle. In the aftermath, the H.I.V.E. trio seizes control of Titans Tower, leaving the remaining Titans in a precarious situation.