Innerspace

A devil-may-care test pilot volunteers to be shrunk and injected in to a rabbit as part of a top secret experiment. When industrial spies steal one of the two microchips needed to reverse the process, the pilot is accidentally injected into the body of a timid supermarket clerk. the two, along with the pilot's girlfriend, have 24 hours to find the stolen microchip before the pilot uses up his oxygen supply. (official distributor synopsis)