The Undead is a 1957 fantasy thriller that was produced and directed by Roger Corman.
A researcher named Quintus hypnotizes a streetwalker called Diana in an attempt to record her past-life experiences as a condemned witch named Helene in the Dark Ages. After numerous attempts by Quintus to influence her, Diana's consciousness decides not to alter the course of history and resigns herself to her fate.
- Richard Garland as Pendragon
- Pamela Duncan as Diana Love / Helene
- Val Dufour as Quintus
- Allison Hayes as Livia
- Mel Welles as Digger Smolkin
- Bruno VeSota as Scroop the Innkeeper
- Dorothy Neumann as Meg-Maud
- Billy Barty as the Imp
- Richard Devon as Satan
- Maurice Manson as Professor Olinger
- Dick Miller as the Leper
- Features an infamous quote, spoken by Quintus towards the end of the film: "STAY!"
- Filmed in a converted supermarket, and completed in six days.
- Inspired by the interest during the 1950s in reincarnation (as was the film The She Creature), especially the book The Search for Bridey Murphy by Morey Bernstein, which had been filmed in 1956. By the time The Undead was being made, the popularity of reincarnation was starting to dwindle, so Roger Corman decided to change things by adding the time travel elements of Quintus and a title change.
- The "bats" that Livia and the imp repeatedly change into were left over props from Corman's earlier movie It Conquered the World.
- The interior set for Scroop's tavern - The Gabriel's Horn - is the same as the Red Dog Saloon from Roger Corman's Gunslinger.