Stanley decides to dispose of his mask by burying it in quick-drying concrete.

When his friends are in danger, Stanley retrieves The Mask to come to their rescue.

When Stanley reluctantly agrees to baby-sit for his neighbours, the mask somehow gets on Baby's face, producing Baby Mask. Baby Mask races away on a high-speed ice cream eating binge with both Stanley and Lt. Kellaway in pursuit.

When Lt Kellaway suspects that Stanley and The Mask are one and the same, he handcuffs himself to Stanley in order to keep an eye on Stanley's every move.

Stanley discovers a fabled sister mask that, when joined with his mask, allows him to control his wild alter-ego. However, things go awry when the sister mask reacts unexpectedly and takes The Mask on a wild ride.

Shadows are being stolen from all over Edge City. Everyone whose shadow is stolen loses his or her youth and starts to age rapidly. The Mask discovers that the shadow thief is Skillit, a 4,000-year-old boy.