Some doors should never be opened.
Four brilliant university students are forced to confront themselves in terrifying ways when their Quantum Physics experiment leads to an entangled parallel existence that leaves them questioning who they are and what is real.
TMDB audience score
Based on 350 votes
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Availability in the UK
Provider listings are supplied by JustWatch through TMDB. Verify pricing and availability before renting or subscribing.
UK only · Refreshed 10 Oct 2026.
MyCinema quick facts
Worked out from the film's TMDB record and its United Kingdom provider listings. These are facts about the data, not a review.
Standard length · 1h 33m
At 1h 33m it sits between 90 minutes and two hours.
Science Fiction · Thriller · Drama
TMDB files it under science fiction, thriller, and drama.
2 subscriptions · 2 free · 5 to rent · 5 to buy
Included with 2 subscription services: Amazon Prime Video and Amazon Prime Video with Ads. Free or ad-supported on Amazon Prime Video Free with Ads and Amazon MX Player. Listed to rent from 5 stores. Listed to buy from 5 stores.
6.6 / 10 on TMDB
TMDB users rate it 6.6 out of 10 across 350 votes, a positive audience score. That is a moderate sample of voters.
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