TMDB20211h 26mScience Fiction / Thriller / Mystery

Infinitum: Subject Unknown

Name: Infinitum: Subject Unknown
Genre: Science Fiction, Thriller, Mystery
Released: 2021-03-03
Duration: 86 min

Destined to repeat forever... The test is to find a way out.

Jane is the subject of a twisted science experiment where she is placed in a parallel world and is forced to find a way to either alter her reality or be stuck in a time-loop, destined to repeat the same test over and over again, with no memory of her doing it before. But with each 'reset' she starts to retain fragments of memory. With clues pointing to the mysterious Wytness Quantum Research Centre, she tries to find a way out. (The film was shot entirely on an iPhone during the UK’s first lockdown.)

TMDB audience score

Based on 59 votes

Saved only on this device unless you sign in.

Availability in the UK

Where the story is waiting

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UK only · Refreshed 11 Oct 2026.

MyCinema quick facts

Infinitum: Subject Unknown at a glance

Worked out from the film's TMDB record and its United Kingdom provider listings. These are facts about the data, not a review.

Runtime

Short watch · 1h 26m

At 1h 26m it runs under 90 minutes.

More horror under 90 minutes

Genres

Science Fiction · Thriller · Mystery

TMDB files it under science fiction, thriller, and mystery.

UK availability

2 subscriptions · 2 free · 6 to rent · 6 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 6 stores. Listed to buy from 6 stores.

TMDB audience score

5.3 / 10 on TMDB

TMDB users rate it 5.3 out of 10 across 59 votes, a mixed audience score. That is a moderate sample of voters.

Why watch Infinitum: Subject Unknown tonight

It is a short one: 1h 26m, so it fits a late start.
It is included with Amazon Prime Video and Amazon Prime Video with Ads in the UK, so there is no rental fee if you already subscribe.