Innerspace is a sci-fi comedy about a devil-may-care test pilot, Tuck Pendleton (Dennis Quaid) ,shrunken smaller than a blood cell. After an attack on the lab where he was shrunk a scientist injected into the butt of Jack Putter (Martain Short). What happens next is classic 1980s hi-jinks with a sprinkling of pretty good practical effects. This of this as a lessor version of Ghostbusters.