Stanley (Jim Carrey), a bank clerk, is honest and lives an ordinary life like all honest people. Once, Stanley fell deeply in love with the blonde beauty Tina (Cameron Diaz) when he received her. Unexpectedly, Tina was sent by the gang leader Dorian (Peter Greene) to scout the terrain before robbing the bank. Dorian then successfully robbed the bank where Stanley was. One night, Stanley accidentally got a strange mask. After wearing the mask, Stanley became extremely powerful and agile. Stanley began to tease those who bullied him on weekdays, and robbed the huge sum of money robbed by Dorian, and danced with Tina in the nightclub. After Dorian knew the power of the mask, he took the mask away with a trick, and Stanley was put in prison. Can Stanley finally take back the mask with his own wisdom and marry Tina?