Prepare cake batter and bake as directed on package for 13x9-inch pan, lining pan with foil sprayed with cooking spray before adding batter. Cool cake in pan 15 min.; invert onto wire rack. Cool completely; cut into pieces and arrange on platter as shown in diagram
, using toothpicks to attach the robot's hands and feet to top of cake. Discard cake trimmings or reserve for snacking.