In this ingenious comedy adventure from director Joe Dante, Dennis Quaid plays hell-raising Navy test pilot Tuck Pendleton, the world's first "micronaught". In a top-secret government miniaturisation experiment, Tuck is shrunk within his space-age capsule. Stolen by industrial terrorists, who want to sell the new technology on the black market, Tuck is accidentally injected into the body of hypochondriac grocery clerk Jack Putter (Martin Short). With the terrorists in hot pursuit, Jack must come to terms with the strange voice in his head while Tuck has to figure out a way of escaping from Jack's body and returning to his normal size. Their only hope is Tuck's journalist girlfriend Lydia (Meg Ryan) but Jack has suddenly developed a crush on her...