->This article is about the film. For actual undead, [[TheUndead go here]].

Two psychiatrists and a hooker walk into an office. Set up to a bad joke or set up of a bad Creator/RogerCorman movie?

You don't have to choose!

An ethically challenged "psychical researcher" by the name of Quintis has hired a Brooklyn streetwalker named Diana for $500. But in this movie, she'll be turning the trick of ''{{time travel}}''. See, Quintis believes he can put Diana into a hypnotic trance and send her back into her past lives. His colleague, a somewhat homely bald man, is skeptical. Turns out that Quintis is kind of an evil genius. He succeeds in putting Diana into that trance and he succeeds in sending her back in time to a past life as "Helene," who is wrongfully accused of being a witch and thus faces execution in the morning. Score one for Quintis.

What follows is a somewhat mangled string of plots, counter-plots, knights, witches, "enchanted" gravediggers, imps, taverns, more time travel and princes of darkness. Yes, {{Satan}} is an important player in Mr. Corman's little production. As Quintis explains a few times, never very clearly, Diana/Helene is left with a choice: because Diana helped Helene escape prison before her execution as a witch, Helene can either live out her life in DarkAgeEurope with her mediocre love interest, and in doing so snuff out the existence of her future lives from the time paradox, or go back and allow herself to get beheaded at dawn on schedule, thus ensuring all future iterations of Diana will exist and flourish.

For the ''Series/MysteryScienceTheater3000'' version, please go to the [[Recap/MysteryScienceTheater3000S08E06TheUndead episode recap page]].

!This film contains examples Oo:

* AnachronismStew: Among other things, Smolken's hearse is Victorian-era style in an ambiguously medieval setting, and Livia's dress has a zipper.
* AcCENTUponTheWrongSylLABle: In addition to "PENDRA-gon," "Nepal" is apparently pronounced with the stress on the first syllable, so it sounds like... [[NippleAndDimed something else]].
* AerithAndBob: Starring Pendragon, Scroop, Livia, Gobbo, Quintis, and...Meg.
* BeautyEqualsGoodness: Inverted with [[DarkIsNotEvil Meg]] and [[EvilIsSexy Livia]]
* CantTakeAnythingWithYou: Quintis shows up in the past without a stitch on. Possibly the inspiration for ''Film/TheTerminator''.
** But he somehow does still have his wristwatch in the past.
* CloudCuckooLander: Smolken.
* CoolOldLady: Meg Maud, who is probably the most competent character in the whole picture.
* CreepyGood: Meg.
* CrossoverCosmology: Even though Satan and most medieval Christian folklore is demonstrably real, reincarnation is a major part of the film's premise.
* TheDeadCanDance: To attempt to put those attending The Witches' Sabbat at ease, Satan calls for "Song and dance and gaity!". What comes forth are a trio of corpses dancing languidly to a morose tune.
* DealWithTheDevil: And get a free tattoo in the bargain!
** Livia almost tricks Pendragon into selling his soul to free Helene (again, although she was ''already'' free at the time); Quintis talks him down by suggesting that he ''rent'' his soul to Satan, instead. The Devil doesn't bite.
* DeathEqualsRedemption: Helene's HeroicSacrifice inspires Diana to rethink her life.
* DidYouJustScamCthulhu: Some while back, Meg actually managed to outwit the devil, losing her beauty but keeping her supernatural insight along with her soul.
* DisposableSexWorker: Implied but ultimately subverted. Quintis is perfectly willing to throw Diana's life away, but [[ReasonableAuthorityFigure Prof. Olinger]] steps in to make sure she's safe.
* EstablishingCharacterMoment: [[MorallyAmbiguousDoctorate Quintis]] makes it clear to his old professor that if he won't help him with his experiment, he'll carry on alone-- even if it means Diana's death. [[ReasonableAuthorityFigure Olinger]], though disgusted and incredulous, goes along with him to make sure Diana gets through the session alive.
* EvilIsHammy: Richard Devon steals any scene he's in as Satan.
* FanService: Allison Hayes as Livia, the evil witch. Va-va-voom.
** Helene's dress seems to be meant to draw your eyes to her breasts.
* ForTheEvulz: Satan wants Helene to stay, simply because he would love to see the timeline go nuts over the temporal paradox.
* GoodWitchVersusBadWitch: Meg Maud Versus Livia.
* GratuitousIambicPentameter: Most of the dialog in the past is blank verse, and the meter varies between characters.
* HeroicSacrifice: [[spoiler: Helene decides not to tamper with history for her own benefit, and accepts her wrongful execution.]]
* HerrDoktor: Professor Ulbrecht Olinger may not have the accent, but he definitely has the name.
* HoistByHisOwnPetard: Satan tempts Quintis to wait and watch Helene's execution, only to explain that he was only able to time travel ''[[SanDimasTime when]]'' both Helene and Diana were alive, meaning that he's now TrappedInThePast.
* HotWitch: Livia. According to Meg, she was one of these for awhile, but she lost her youth and beauty when she tricked her soul back from Satan.
* TheImp
* IdiotHero: Pendragon is a good knight. He is not a smart one.
* {{Irony}}: Diana, a prostitute, shares her name with the virgin goddess of the hunt.
* InSpiteOfANail: Despite the body count presumably being vastly different in the original history, history works out as long as Helene dies on time.
* LanternJawOfJustice: Pendragon.
* LargeHam: Many cases, of course, but Quintis is the best example when he tries to convince Helene to '''STAY!!!!''' in the past.
* LawfulStupid: Oh, dear God, Pendragon.
* MakeWrongWhatOnceWentRight: Quintis wants to alter time for the hell of it. So does Satan.
** Quintis goes back and forth on this. When he first alters the timeline by sending Diana back he panics when he realizes what happened, and goes back himself specifically to fix it. When he realizes the situation is more complicated he concludes that it should actually be Helene's decision. By the the moment of truth however, he tries to talk her into staying just to see what will happen.
* MaleGaze: Livia is introduced for a second time by a slow pan up her body.
* MuggedForDisguise: Quintis. Again, possibly the inspiration for the ''Franchise/{{Terminator}}'' films.
* NotSoDifferent: Implied by Satan to Quintis at the end.
* ObfuscatingInsanity: Smolkin has a bizarre manner and claims to be mad, but his actions are entirely rational bordering on OnlySaneMan. This allows his casual palling around with both sides even though he's in the good camp. Pendragon calls him on this.
* OurTimeTravelIsDifferent: Apparently when you send someone's spirit back in time, your ''body and soul'' can ride piggy-back on it.
** FridgeBrilliance / TruthInTelevision: It's actually a brilliant concept of time travel that was also the basis for ''Series/QuantumLeap''.
** Quintis must piggyback ''Helene's'' soul to travel back, which might explain why he arrives in the nude as himself.
* PluckyComicRelief: Smolkin the gravedigger.
* {{Reincarnation}}: Exploiting a fad of interest in the topic at the time the film was made. See also ''Film/TheSheCreature''.
* RhymesOnADime: Smolkin, who sings most of his dialog.
* SadisticChoice: If Helene submits to execution, her cycle of reincarnations live on. If she runs, Helene lives the rest of her life, but all her future lives will never come to be.
* SanDimasTime:
-->'''Quintis:''' Please, Professor, we must hurry. (Looks at watch) The time here probably matches the time then, which means that it's close to midnight, the time before the Witch's Sabbath.
* {{Satan}}: A particularly silly looking one.
* SatireParodyPastiche: Smolken's morbid variations on old {{Playground Song}}s.
* SmugSnake: Quintis, oh so much.
* SummationGathering: When the entire main cast gathers in the cemetary near the end for Quintis to exposit about Helene's condition.
* TemptingFate: Scroup, the tavernkeeper. "No one can say that Scroup is one to lose his head!"[[note]]'''SOL Crew:''' "Scroup is one to lose his head!"[[/note]]
** HumanSacrifice: "Then Scroup is a liar... and a head is needed for the Sabbath!" ([[OffWithHisHead Chop.]])
* TheVamp: Livia, who constantly tries to seduce Pendragon into either loving her or selling his soul.
* VoluntaryShapeshifting: Livia and her imp can do this with the aid of a MatchCut and a sparkler.
* YeOldeButcheredeEnglishe: "Noweth?"
** Possibly a {{Mondegreen}}; the line might be "now that" under-enunciated.