Tom Clancy’s Rainbow Six Siege is about to enter sci-fi horror territory with the launch of the new Outbreak cooperative game mode, which will run from March 6-April 3.

Originally released by Ubisoft back in 2015, most of Rainbow Six Siege’s game modes up until this point had you fighting terrorists, although during the Outbreak event you’ll be facing off against everything from zombies to hulking alien monstrosities. The premise of Outbreak is fairly simple: A spacecraft crashes in the town of Truth or Consequences in New Mexico, unleashing a parasite which mutates the local populace. As a member of the elite Rainbow Six task force, your job is to eliminate the mutated creatures and contain the parasite before it spreads.

If you’re one of the 25 million people who already plays Rainbow Six Siege, you can learn more about the Outbreak event ahead of its launch on the game’s official website.

Tom Clancy’s Rainbow Six Siege: Outbreak Synopsis:

A few days ago, a mysterious space capsule crashed near Truth or Consequences in New Mexico. It turned out to be carrying an exotic parasite, the Apex, which infected the area and turned the town’s populace into monsters. The Quarantine Zone is the only thing keeping it contained, but it will not last for long. If the parasite gets out, it would be a disaster of global proportions. Millions would die. Rainbow’s mission is to enter the devastated town and destroy the parasite’s roots before this happens.