A chaotic comic fantasy about Elizabeth, an ineffectual young woman (Phoebe Cates) who leaves her unfaithful husband and returns home only to be oppressed by her overbearing mother. She comes across one of her childhood toys, a Jack-in-the-box, in which her frustrated mother imprisoned Elizabeth's childhood "imaginary" friend Fred, many years ago. Low and behold she opens the box once more, and out springs Fred with 21 years of pranks stored up! The mischievous Fred enters Elizabeth's life like a whirlwind, shaking her out of her passivity with his outrageous antics. Egged on by her manic little sidekick and his hilarious escapades, a revitalised Elizabeth embarks on a campaign to win back her errant husband. Rik Mayall is perfectly mischievous and off-the-wall as the chaos-creating pal in this impish tale.