
Screenshots

Watch trailer on Steam ↗The Origin Theory - Episode One
Juhana Karhu · Published by Juhana Karhu
Content notice: Constant dismemberment of bodyparts of zombies usually including some gratifying blood-splatter effects as an added bonus.
9 user reviews — 78% positive (9 reviews)
Last updated 28 Sept 2026
Origin Theory Episode One is a lighthearted story driven survival horror experience. Game has its classic bad guy, zombies, guns and nasty stuff, but the emphasis is on unraveling the mystery and not grinding down hordes of enemies and surviving bullet soaking boss fights.
Adventure, Free To Play · 2024 · More free games
Explore a lighthearted survival horror world where you solve puzzles to uncover secrets while battling undead foes. Experience The Origin Theory - Episode One, a free-to-play adventure from Juhana Karhu.
About this game
Origin Theory Episode One is a lighthearted story driven survival horror experience. Game has its classic bad guy, zombies, guns and nasty stuff, but the emphasis is on unraveling the mystery and not grinding down hordes of enemies and surviving bullet soaking boss fights.
Ethan is an oil rig engineer on a mission with his crew mates to respond to an SOS signal originating from an uninhabited volcanic island. They soon discover that the island is not without its residents and the mission takes a bad turn. Crash landed and separated from his crew, Ethan is taken deeper into the island complex.
Now alone and armed with only his ability to use duct tape, Ethan finds himself in the middle of a darkening mystery. Trapped inside the complex, Ethan must use his wits to escape, explore the shadows, fight for survival, find out the fate of his crew mates and unravel the mystery surrounding the island.
Unravel The Mystery
Follow a narrative experience and uncover the dark secrets behind the events taking place in the Ren island through the logs of the ill-fated staff and captives.
Collect Resources To Survive
Collect resources found and hidden throughout the levels to buy upgrades to your arsenal. Upgrade weapons with parts scattered along the way.
System Requirements
Will my PC run this? →Minimum
- OS: Windows 11
- Processor: N/A
- Memory: 16 GB RAM
- Graphics: N/A
- DirectX: Version 12
- Storage: 30 GB available space
Recommended
- OS: Windows 11
- Processor: N/A
- Memory: 16 GB RAM
- Graphics: N/A
- DirectX: Version 12
- Storage: 30 GB available space
Supported Languages
*languages with full audio support
Latest news
Patch NotesOfficial
Patch 2.09
- Source level has a small room with robot elevator and a gas trap on the bottom. Player was able to trigger the gas trap by moving very close to the exit door which led to the dead of the player. Gas trap trigger has now been scaled down and problem fixed. - Added 10 second HUD health warnings to parts of the game where health drops down to 1 at the end of a video sequence. - Trains station magnet crane cables animation had a problem that chopped off cables at certain height. - A rare sequence of events on Train Station left player unable to lift forklift with magnet crane to the other side of the tracks and unable to complete objective. This is now fixed. - Added two robot guards to the last level player has to take care of before entering church and starting final sequence.Read full article on Community Announcements (0Downloads)Patch NotesOfficial
Patch 2.08
- Removed annoying fixed rotation from exit crane control functions and player now exits facing the direction they where facing when exit was called. - Added few dozed more interaction prompts to objects still missing them. - Moved a wooden plank on Sandbox level hydro electric plant that went through the elevator floor while elevator was rising up. - Train station magnet crane gave "Exit crane" interaction prompt after objective was completed. Changed this to "Examine". - Start level beginning room cryo station fuse box was interactive and gave player the "Missing fuse" objective while it should of been static object. This is now fixed and the missing fuse objective is now correctly given to player few rooms later on the same level. - Start level director office projector globe was interactive and gave player some prompts while it should of been static object. This is now fixed and the only interactive globe is located elsewhere on the same level. - Gun shop "Buy" switch gave player "Not in use" prompt. This is now changed to "Buy selected weapon". - Lab level lower platform had a buggy spider web material which has now been changed. - Lab level pumproom bot firmware upload room where bots are hanging in loading station had some misaligned meshes which have now been moved into correct places. - Corrected a typo in biohazard detector blueprint.Read full article on Community Announcements (0Downloads)Patch NotesOfficial
Patch 2.07
- If player loaded autosave immediately after encoding elevator panel in Sandbox level hydro electric plant, encoded panel disappeared both from docking station and inventory. Also if player saved game after inserting panel into encoding docking station and saved and loaded game this also caused panel to disappear from docking station and inventory. These are now fixed. - Fixed a bug in Sandbox level where ambassador toilet booth animation could be opened multiple times simultaneously causing audio overlap. - Fixed couple of more trigger boxes that had collision settings enabled that caused bullets to fly in not so straight line if fired through them. Most of these didn't effect gameplay because of their placement, but fixed them anyway. - Fixed ammo shop bug where NATO and shotgun bullets where sold under wrong button selections. - Security robots alert other nearby security robots of player sightings. - Security robots move faster. - Exploding security robots cause damage to player. - Added health warning that flashes red in HUD for ten seconds if health drops to 15 or under. - Fixed an interaction bug on Train Station level magnet crane controls. - Added interaction info to couple of objects that were missing it. - Added footstep sound effects to both ends of teleporting ladder blueprint.Read full article on Community Announcements (0Downloads)Patch NotesOfficial
Patch 2.06
- Fixed security robot body and head damage from shotgun blast to correct levels. - Activated one main objective at the start of Sandbox level and another once player reached hydro electric plant. - Interacting with deactivated biohazard detectors on Sandbox level now gives player the current count of deactivated detectors in the grid. - Reassembling broken Bulb in Factory level now gives objective completed notification only once Bulb is fully assembled and not from each limb separately. - Made red flashing color indicating player taking damage in HUD more visible. - Adjusted one streaming volume on Nest level that caused landing pad railing to disappear from view. - There is now a 75% chance instead of previous 50% chance that zombies die from a single shotgun blast to body.Read full article on Community Announcements (0Downloads)Patch NotesOfficial
Patch 2.05
- Fixed a small bug on first level projector globe desk interface when player was using pad controls. - Forklift exit controls trigger box visibility collision was incorrectly active by default and reacted on bullets. Now it activates when player controls forklift and deactivates on exit. - Activated one objective at the start of Train station level and another once player reached top level with elevator to give player better sense of... well objectives.Read full article on Community Announcements (0Downloads)






