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''Equinox: A Journey into the Supernatural'' is a low-budget CultClassic BMovie from 1968, which is featured in Creator/TheCriterionCollection. It is largely notable because its director, Dennis Muren, later went on to do special effects for ''[[Film/ANewHope Star Wars]]'' and was a founding member of Creator/IndustrialLightAndMagic.

Recut in 1970 by Jack Harris (the man who also produced ''[[Film/TheBlob1958 The Blob]]'') and retitled simply ''Equinox'', it enjoyed a long run on late night TV and in the midnight/drive-in circuit. More footage was shot by a different director, who saw fit to put himself in the movie as the new main antagonist, Asmodeus.

Told in flashback as a reporter follows up on an interview with a man in a psychiatric ward he did a year prior. A young man named David is called by his geology professor to visit him to discuss something important at the professor's mountain cabin. He diverts a double date with his friends up to the mountain to meet the professor, only to find the professor's house crushed and no sign of him. Trying to find the professor they chance upon a crazy old man in a cave who forces an ancient book on them, but soon they find themselves pursued by giant creatures sent to recover the book for themselves.

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!!Tropes present in Equinox include...
* AttackOfTheFiftyFootWhatever: The various creatures, especially the blue-skinned ogre and the creature that kills the old man.
* CassandraTruth: No one believes Dave's story.
* CharacterFilibuster: Dave ''really'' wants you to know about the mythology behind the book.
%%* CuriosityKilledTheCast
* DealWithTheDevil: Asmodeus tries to make one to Jim.
* DerangedParkRanger: Asmodeous, the vicious demon lord summoned by Dr. Arthur Watermann, initially takes the form of a park ranger.
* DevilInPlainSight: Literally. Come on, the guy seriously introduced himself to the kids as Asmodeus.
* DownerEnding: [[spoiler:Everyone gets killed by monsters except for one guy]], and [[AYearAndADay one year and one day later]], well, read the rest of the page.
* EldritchAbomination: The tome summons two of them, one, a squid and the other, an ape. There's also an ogre, but it's less eldritch and more fantasy based.
* FramingDevice: The movie is being told in flashback by Dave in a mental hospital.
* HowWeGotHere: While in the hospital, Dave tells the story of what had happened.
* AYearAndADay: ''[[LargeHam YOU WILL BE DEAD!]]''
* LouisCypher: Park ranger ''Asmodeus''? [[SarcasmMode Subtle]].
* {{Magitek}}: Believe it or not. The magic in this movie relies on symbols and is described as:
-->''... Manipulation of these symbols is treated exactly like the science of chemistry. This element changes that one, one symbol is a catalyst, another is an agent or a counteractant.''
* MeaningfulName: Park Ranger {{ASMODEUS}}!
%%* NeutralFemale: Susan and Vicky.
* ObviouslyEvil: Did anyone really believe for a second that Asmodeus was a real park ranger?
%%* ScreamingWoman: Vicky.
%%* SuccubiAndIncubi: Asmodeus.
* TomeOfEldritchLore: The book they find which is the crux of the plot.
* TooDumbToLive: "I just remembered! 'Asmodeus' is Greek for 'Devil'!"
** Not to mention the whole exploring a dark cave after they heard maniacal laughter from within and the sounds of something gigantic and unseen flying away.
* WhatHappenedToTheMouse: After [[spoiler:Dr. Waterman dies and disappears from reality]], the movie (and characters) seem to completely forget he ever existed at all. Which [[FridgeBrilliance makes sense]], if he ''disappears from reality''.
* YourDaysAreNumbered: [[spoiler:Dave]] is cursed by Asmodeus with, "In a year and a day, ''you will be dead!''" The film takes place a year and a day after that curse. [[spoiler:It happens.]]