Tim Avery, an aspiring cartoonist, finds himself in a predicament when his dog stumbles upon the mask of Loki. Then after conceiving an infant son "born of the mask", he discovers just how looney child raising can be.

Stanley Ipkiss, an insecure banker who has lost his zest for life stumbles upon an ancient mask, that turns him into a confident suave cartoon-like character who upsets his ordinary life.