The rundown
Mammalia (2026)
It shares its release window with Resident Evil, so expect the two fanbases to be reacting side by side.
It hits the big screen on September 16, 2026.
Reactr / Trailer Reactions / Mammalia
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In Theaters · September 16, 2026
Mammalia
Trailer Reactions
Drama · Horror
Antonia (45) and Mavra (27) live together in a house with domesticated animals. Beneath fragile routines, a struggle for dominance unfolds. As care turns into control, their relationship escalates into a disturbing power game that blurs the boundaries between protection, exploitation and violence. What are we? Humans? Or Animals? Or Savages?
Free · no editing · camera or voice only · the clip is yours to post
The Trailer
Start here: the official Mammalia trailer
Dropped August 5, 2026
The credits that matter
The history behind Mammalia
The film comes from Open Borders Productions. Elia Kalogianni directs.
The cast
Who you’ll see in the trailer
Romanna Lobach and Maria Filini lead the cast. Romanna Lobach plays Mavra.
Why react to this one
This trailer was made to be reacted to
Every horror trailer hides one shot built to get you. Find it on camera and see how fast you flinch.
By opening weekend everyone will have a take. The reactions that matter are the ones recorded before the takes calcify.
Reactions on Reactr
Be one of the first to react
Reaction clips for Mammalia will appear here as Reactors share them. The Reactr recorder is free for creators: watch the trailer, record on camera or voice only, and the finished clip is yours to post on your own TikTok, Reels, or Shorts channel.
Record the first reaction →FAQ
Mammalia: quick answers
How do I make my own Mammalia reaction video?
Open the reaction recorder on your phone at reactr.film/studio/mammalia, choose camera or voice only, and press record while the trailer plays. Reactr captures your reaction and gives you a share-ready clip when the trailer ends. It is free.
Do I have to be on camera?
No. Voice Reaction mode records your commentary with the microphone only: the camera stays off, no face is recorded, and you still get a share-ready clip for your channel.
When does Mammalia come out?
Mammalia is scheduled to open in US theaters on September 16, 2026. Dates can shift, so check back for updates.
Who stars in Mammalia?
Romanna Lobach and Maria Filini lead the cast, directed by Elia Kalogianni.
Is Reactr free?
Yes. Recording reaction clips on Reactr is free, with no paywall on the finished clip. You own your clip and can post it to TikTok, Reels, Shorts, or anywhere else. Reactr makes money from studios and sponsors, not from creators.
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Your first reaction only happens once
Watch the Mammalia trailer, hit record on camera or voice only, and the clip is yours to post.
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