Sesame Street Stays Up Late/The Mask

The Movie

 * Cookie Monster as Stanley Ipkiss
 * Telly Monster as The Mask
 * Tiffy as Tina Carlyle
 * Alfa as Peggy Brandt
 * Mrs. Grouch as Mrs Peeman
 * Elmo as Charlie Schumaker
 * Oscar the Grouch as Dorian Tyrell
 * Uncle Hank and Moishe Oofnik as Dorian Tyrell's Side-kicks
 * Bert and Ernie as Lt. Mitch Kellaway and his Side-kick; Doyle
 * Penguins and Lambs as The Police

The Animated Series

 * Cookie Monster as Stanley Ipkiss
 * Telly Monster as The Mask
 * Alfa as Peggy Brandt
 * Mrs. Grouch as Mrs Peenman
 * Elmo as Charlie Schumaker
 * Bert and Ernie as Lt. Mitch Kellaway and his Side-kick; Doyle
 * Oscar the Grouch, Uncle Hank, Moishe Oofnik and Uncle Fred as The Villains