Director David F. Sandberg makes cameo appearances performing as each of the three Crocodile-Men (collaboratively assisted by Steve Newburn and Ned Morill), and provides the voice of the alien lifeform Mister Mind during a mid-credits sequence.[15] Sandberg's wife, actress Lotta Losten, portrays Dr. Lynn Crosby; a researcher working with Dr. Sivana, who is killed by him.[16] Sound designer Bill R. Dean has an uncredited cameo, providing the voice for a Batman toy,[17] while Ryan Hadley, Zachary Levi's stunt double, appears uncredited as a stand-in body double for Superman.