Innerspace (1987)
Innerspace follows Tuck Pendleton, a daring test pilot who takes part in a groundbreaking miniaturization experiment. However, things take a wild turn when he is accidentally shrunk and injected into the body of Jack Putter, a neurotic hypochondriac. To survive, Tuck must persuade Jack to locate his ex-girlfriend, Lydia Maxwell. Together, they race against time to extract Tuck and his miniature vessel before he runs out of oxygen, leading to a series of hilarious and chaotic adventures along the way.
