Larry Drake gives a Razzie-worthy performance as the titular doctor, an escaped mental patient who murders everyone in sight. The opening scene is a total mindfuck - it's worth it just for this scene alone
Each murder is done in a different doctor-y way, and comes with a fresh catchphrase (move over, Schwarzenegger ice puns). The gore is topnotch quality. Best part of the movie.
Keep your eyes peeled for performances by Doug E. Doug, and Mark from Roseanne.
I saw this as a kid, and I always assumed it was an 80s movie. It sure feels like one.