Instead of healing the, an evil doctor decides to use his mental patients in gruesome experiments, and ends up being killed by a not-quite-so-evil colleague for his trouble. Instead of calling the police like the sensible man he's supposed to be, the doctor just barricade the room to the evil lab and calls it a day. But, proving yet again that it's important to check for a pulse before writing somebody off, several years later the evil doctor miraculously returns for Round 2, along with his now re-animated horde of undead patients.

This episode is also available as a blog post: http://randommoviemusings.com/2021/06/30/dead-pit-1989/