Innerspace

Innerspace is a 1987 science fiction comedy film directed by Joe Dante and produced by Michael Finnell. Steven Spielberg served as executive producer. The film was inspired by the 1966 science fiction film Fantastic Voyage. It stars Dennis Quaid, Martin Short and Meg Ryan, with Robert Picardo and Kevin McCarthy, with music composed by Jerry Goldsmith. It earned 25,893,810 of domestic gross revenue and won an Oscar, the only film directed by Dante to do so.

Experiment supervisor Ozzie Wexler John Hora, knowing their intentions, escapes with the syringe. A chase ensues with one of Cankers henchmen, the cyborg Mr. Igoe Vernon Wells, which terminates at a nearby shopping mall. After being fatally shot, Ozzie injects Tuck and the pod into an unsuspecting Jack Putter Martin Short, a hypochondriac Safeway grocery clerk, the first person he comes into contact with.On awakening from unconsciousness, Tuck is unaware of what has happened and believes hes been injected into the rabbit. After attempts to radio the lab are unsuccessful, Tuck navigates the pod to the optic nerve and implants a camera so he is able to see what the host sees. Realizing he is inside a human, Tuck makes contact by attaching another device to Jacks inner ear, enabling him to talk to Jack, initially with embarrassing consequences. Tuck explains that the pod has only a few hours supply of oxygen and needs his help in order to extract him by going back to the lab. ........

Source: Wikipedia