A cocky pilot, Tuck Pendleton, becomes miniaturized and is injected into a hypochondriac, Jack Putter, when his vessel is stolen. With Tuck linked to Jack's systems, they discover the theft and are told they must retrieve the stolen material to restore Tuck before his oxygen runs out.

Innerspace
A daredevil test pilot is miniaturized as part of a secret operation, only to find himself merged with the persona of a hapless department store employee.