This content requires the base game The Callisto Protocol™ on Steam in order to play.

Recent Reviews:
Mixed (13) - 53% of the 13 user reviews in the last 30 days are positive.
All Reviews:
Mixed (660) - 52% of the 660 user reviews for this game are positive.
Release Date:
Jun 28, 2023

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Downloadable Content

This content requires the base game The Callisto Protocol™ on Steam in order to play.

Buy The Callisto Protocol - Story DLC


About This Content

The biophage virus threatens to spread beyond the walls of Black Iron Prison. Fight through the derelict penitentiary in a last-ditch attempt to retrieve Mahler’s data, get it off Callisto and redeem yourself.


Black Iron Prison is in ruins and crawling with biophage. But your work on Callisto isn't finished yet. Survive the horrors lurking in the shadows long enough to retrieve Dr. Mahler’s research and transmit it off-world. Discover the harrowing depths of Mahler’s experiments and the vast reach of Kallipolis’ influence.


Not only must you face the monstrosities and Security Units lurking the halls of Black Iron but a new abomination – part biophage, part machine – now stalks the crumbling prison. Keep your guard up and use every weapon at your disposal to destroy these powerful new enemies.


The terrors lurking Black Iron are imposing... but so are you. Acquire the all-new Kinetic Hammer to take down hordes of biophage. Use the heavy-hitting hammer to bludgeon a single biophage and crowd control multiple enemies at once or use the charged heavy attack to deal massive damage and dismember your adversaries.

Mature Content Description

The developers describe the content like this:

This DLC may contain content not appropriate for all ages, or may not be appropriate for viewing at work: Frequent Violence or Gore, General Mature Content

System Requirements

    • OS: Windows 10/11
    • Processor: Intel® Core™ i5-8400 or AMD Ryzen™ 5 2600
    • Memory: 8 GB RAM
    • Graphics: NVIDIA® GeForce® GTX 1060 or AMD Radeon™ RX 580
    • DirectX: Version 11
    • Storage: 75 GB available space
    • OS: Windows 10/11
    • Processor: Intel® Core™ i7-8700 or AMD Ryzen™ 5 3600
    • Memory: 16 GB RAM
    • Graphics: NVIDIA® GeForce® GTX 1070 or AMD Radeon™ RX 5700
    • DirectX: Version 12
    • Storage: 75 GB available space

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