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The Callisto Protocol Final Transmission

Offers

  1. Steam2.0 · 560 reviews
    $14.99View Offer
  2. Epic Games Store1.3 · 7.5K reviews
    $14.99View Offer

Trailers & screenshots

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About The Callisto Protocol Final Transmission

The Callisto Protocol Final Transmission is an add-on that continues the story at Black Iron Prison. With the prison in ruins and crawling with biophage, you fight through it to retrieve Dr. Mahler’s research, transmit it off-world and redeem yourself. Along the way, you uncover the depths of Mahler’s experiments and the reach of Kallipolis’ influence.

New enemies

You face the biophage and Security Units in Black Iron’s halls, as well as a new abomination that combines biophage and machinery. These powerful enemies stalk the crumbling prison.

The Kinetic Hammer

The add-on introduces the Kinetic Hammer. Its heavy attacks can bludgeon one biophage or control a crowd, while a charged heavy attack deals massive damage and dismembers enemies.

Frequently asked questions

Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.

Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.

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