Cindy (Margo) was an avowed virgin before she decided to investigate the world of witchcraft after finding out one of her ancestors was executed at the Salem Witch Trials for practising it. There are three dimensions that the majority of citizens of Planet Earth exist in and never think about any of the others - but there are others, there is the fourth dimension which Cindy is about to meet an entity in, that entity being her ancestor Abigail (Esoterica). After one evening alone in her student room practising candle magic, she makes a mentalist breakthrough and contacts Abigail, who tells her psychically that she can offer her incredible orgasms while remaining a virgin...
Talk about making her an offer she couldn't refuse in this, one of the lowest budget movies to ever see the inside of a cinema, and certainly one of the furthest "out there". It was the brainchild of one Lawrence Milton Boren, who used a pseudonym to conceive of and direct what has turned into a minor cult item thanks to its sheer strangeness, even if much of that strangeness was conjured up on the cheap. They do say if you want to make movies, then don't wait for someone to give you an opportunity, just go ahead and do it yourself which was evidently advice Boren took, not that it helped his screen career when it was the only film he ever made.
Boren was very much into his esoterica, not the actress playing the witch but the whole concept, being a way, he claimed, to take a trip without drugs. Whether he succeeded is a different matter as some viewers report they regarded the experience so boring they found their attention wandering, if not actually nodding off, though if that led to bizarre visions was debatable as even the ones in the film were mostly of the filters and joke shop paraphernalia variety therefore not exactly mindblowing. Boren, being a member of the consciousness-expanding World of Tomorrow Foundation, also said he was a contactee and had a unique vision of the netherworlds beyond most people's ken, except he had a problem translating that to celluloid.
Unless the results were indeed entirely accurate as to what he wished convey, in which case perhaps we would be better off without taking excursions into the Fourth Dimension, or any other of the less travelled dimensions as the fourth one is of course time which scientists assure us we are inhabiting anyway, without need of magic. That said, the witch Abigail does seem to be able to move around the centuries as if untethered to any material existence, though what she does with this freedom is simply make a nuisance of herself, not only to Cindy ("Margo" apparently wishing to conceal her actual identity under a huge blonde wig) but to others in her orbit as well. Starting by introducing the student to masturbation and her first cosmic climax, soon Abigail's controlling power has her seduce a homosexual neighbour in his garden.
Seriously, couldn't they be seen by passersby? Anyway, now Cindy is under her spell, the witch begins a more unsavoury plan of action which culminate in the girl being seduced by her Aunt Fanny (Annette Michael) and invited to have sex with a snake her best friend Jan (Tracy Handfuss) has pulled out of her "rectum". It's not even a very big snake, but this is the final straw for Cindy and her rejection of Abigail leads the sorceress to turn her brother (Tom Yerian) into a vampire with a couple of plastic fangs and a preference for going out in barely discernable scenes shot at night. There's no dialogue to this, incidentally, just a series of monologues which may or may not have been performed by the actors we see, and those lines have been subjected to censorship, so what starts as Abigail's enthusiastic catchphrase, "Come on Cindy, let's fantasy fuck!" becomes "Let's fantasy f..." later on. With a selection of classical excerpts on the soundtrack as well as Pink Floyd's Saucerful of Secrets (did they give permission?), it's the psych rock theme tune that stays with you. Because it's played so bloody often.