Iron Lung (2026): Cast, Ratings, Box Office & Ending
Iron Lung is a 2026 sci-fi horror film starring Mark Fischbach as Simon, Caroline Kaplan and Elle LaMont. It runs 2 hours 7 minutes and earned $50 million worldwide on a $3 million budget. Critics gave it 61% on Rotten Tomatoes and 55 on Metacritic.
- Released
- Runtime
- 2h 7m (127 min)
- Original language
-
English
- Studio
- Markiplier Studios
- Budget
- $3M
- After the credits
- Yes Extra scene during or after the credits
What Is Iron Lung About?
The premise of Iron Lung without spoilers. The whole story and the ending explained are in the plot summary further down.
Set in a bleak, post‑apocalyptic world after the Quiet Rapture, a condemned prisoner pilots the cramped submarine Iron Lung across a crimson, blood‑colored ocean that covers a desolate moon. Driven by a desperate mission, he dives into the hostile depths to locate the vanished stars and lost planets, confronting isolation and danger at every turn.
Iron Lung Cast & Characters
Mark Fischbach leads the cast as Simon, with Caroline Kaplan as Ava and Elle LaMont as SM-8 Research Assistant, The Whisper.
- Mark Fischbach as Simon
- Caroline Kaplan as Ava
-
Elle LaMont as SM-8 Research Assistant, The Whisper - Elsie Lovelock as SM-8 Research Lead, The Speaker
Also Starring in Iron Lung
· 12 more- Seán McLoughlin Jack
- Troy Baker David
- Danielle Evon Ploeger Tow Ship Pilot
- Alanah Pearce A Familiar Voice
- Rahul Kohli
- Dave Pettitt The Father
- Ethan Nestor
- Valkyrae
- Isaac McKee Young Simon
- Asher Wagh Children of Eden
- Kazuki Jalal Children of Eden
- David Szymanski David Szymanski
Iron Lung Reviews & Ratings
Critics gave Iron Lung 61% on Rotten Tomatoes and 55 on Metacritic. Our Echo Score gives it 81/100, strongest in character & emotion (85) and weakest in story & flow (70).
Iron Lung Echo Score Breakdown
Iron Lung delivers a distinctive, claustrophobic vision that sets it apart in the sci‑fi horror niche. The direction and production design craft a visceral, blood‑filled submarine environment, while Markiplier’s performance anchors the narrative with solid intensity. Critics note sluggish pacing and occasional editorial roughness that blunt the film’s tension, yet many viewers find the atmospheric sound design and layered visual cues rewarding on subsequent watches. The net impression is a bold, mood‑driven piece with strong craft elements that shines when revisited, though its deliberate slow burn may deter those seeking immediate thrills.
Our own 0–100 rating, built from five aspects: art, character, story, the sensory experience and how well a film rewatches.
- Art & Craft 75
In terms of art and craft, the film exhibits a striking visual identity, using dim lighting and cramped set design to convey claustrophobia. Direction demonstrates growing confidence, delivering effective scares despite occasional tonal inconsistency. Production design’s blood‑saturated aesthetic is immersive, yet editing choices contribute to uneven pacing that weakens overall momentum. Overall, the craftsmanship is solid with room for refinement.
- Character & Emotion 85
When evaluating character and emotion, Markiplier’s portrayal stands out as intense and committed, providing the film’s emotional anchor. Supporting characters, however, receive limited development, leaving their motivations ambiguous. Chemistry between leads feels functional but not deeply nuanced, and flashback sequences that could enrich backstory are sparse. Consequently, performances are strong at the center but peripheral depth remains underexplored.
- Story & Flow 70
The story’s premise—a solitary descent in a blood‑filled submersible—offers originality and a potent sense of dread. Yet pacing drags through extended static sequences, causing momentum to falter and the climax to feel exhausting rather than cathartic. Narrative coherence suffers in the final act, with ambiguous resolution that some viewers find confusing. Overall, the plot is inventive but hampered by sluggish rhythm and unclear closure.
- Sensory Experience 78
Sensory experience is a notable strength, with sound design that amplifies claustrophobic tension through low‑frequency hums and punctuated metallic clangs. The soundtrack’s sparse cues complement the stark visual palette, reinforcing the dread of an endless crimson abyss. Some reviewers note occasional visual distortion that obscures detail, yet the overall audio‑visual cohesion sustains immersion. In sum, the sensory elements effectively heighten the film’s horror atmosphere.
- Rewatch Factor 85
Rewatch factor is elevated by the film’s layered construction; subtle visual cues and thematic repetitions become clearer on subsequent viewings. The slow, contemplative pace rewards patient audiences, revealing additional narrative texture and reinforcing the oppressive mood. While some may find the initial sluggishness off‑putting, the lingering sense of unease ensures the experience remains memorable. Consequently, repeated watches enhance appreciation of its atmospheric depth.
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Rotten Tomatoes 61% Tomatometer
Popcornmeter 86%
See on Rotten Tomatoes -
Metacritic 55 Metascore
User score 7.4
See on Metacritic -
TMDB 68% User score
See on TMDB
Iron Lung Plot Summary & Ending Explained
What happens in Iron Lung from start to finish, spoilers included, with a timeline of 12 key events and the ending explained. The opening is below; the full summary is a 3-minute read.
Spoilers ahead
In a distant future, a cataclysmic event known as the Quiet Rapture severs all contact with colonized planets—star systems vanish, and humanity is reduced to a fraction of its former size. The story centers on Simon [Mark Fischbach], who is imprisoned for his role in the destruction of Filament Station. His punishment is to test and pilot the SM-13 submarine, nicknamed the Iron Lung, on a perilous mission: descend into an ocean of blood on a moon called AT-5 and return with proof that will grant him freedom if he survives. The sub is welded shut, the porthole sealed, and Simon’s only window to the outside world is a crude camera, with limited radio communications sparking frail contact with the surface.
Full summary
The whole story of Iron Lung, scene by scene, with the ending explained
Iron Lung Box Office & Budget
Iron Lung grossed $50 million worldwide on a $3 million budget, 17 times what it cost. $40.9 million came from the US and Canada and $9.2 million (18%) from the rest of the world.
Worldwide gross
$50M
17× its budget
- US & Canada
- $40.9M
- International
- $9.2M
- Budget
- $3M
Iron Lung Trailers & Videos
4 videos: 3 trailers and 1 teaser.
- Trailer Final Trailer
- Trailer Official Trailer
- Teaser Official Teaser Trailer
How Well Do You Know Iron Lung?
10 questions about the story, each with a hint if you get stuck. Pick an answer to see whether you were right.
Question 1 of 10
- Question 1: not answered
- Question 2: not answered
- Question 3: not answered
- Question 4: not answered
- Question 5: not answered
- Question 6: not answered
- Question 7: not answered
- Question 8: not answered
- Question 9: not answered
- Question 10: not answered
What is the name of the main protagonist who pilots the submarine?
Seen Iron Lung?
Articles About Iron Lung
Our article about Iron Lung: “Iron Lung (2026) Review & Opinions: Critics Praise, Fan Reception, and Storytelling Analysis”.
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Opinions
Iron Lung FAQ: Cast, Box Office & Runtime
Runtime, release date, cast, box office, ratings and post-credit scenes of Iron Lung, each answered in a sentence.
How long is Iron Lung?
Iron Lung runs 2 hours 7 minutes (127 minutes).
When was Iron Lung released?
Iron Lung was released on January 30, 2026.
Who is in the cast of Iron Lung?
Iron Lung stars Mark Fischbach as Simon, Caroline Kaplan as Ava and Elle LaMont as SM-8 Research Assistant, The Whisper, among 16 credited actors.
How much did Iron Lung make at the box office?
Iron Lung grossed $50 million worldwide ($40.9 million domestic, $9.2 million international) on a budget of $3 million.
How is Iron Lung rated?
Iron Lung has 61% on Rotten Tomatoes, 55 on Metacritic and 68% on TMDB.
Does Iron Lung have a post-credit scene?
Yes. Iron Lung has an extra scene during or after the credits, so it is worth staying seated.
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