You may recall a few years back when a pair of llamas escaped in Sun City, Arizona and instantly became internet celebrities. The two camelids ran free like Butch Cassidy and the Sundance Kid for an afternoon, as countless Twitter users cheered them on.

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But what if this adorable romp portended something far darker than an uncharacteristically cheerful day on social media? What if the llamas… had a plan?

That plan might include the destruction of human civilization, at least according to Vicious Attack Llama Apocalypse, a game by South African developer RogueCode that comes out Monday – which just so happens to be the three-year anniversary of that first warning in Arizona.

Llamas have overrun the world, and it’ll be up to you (and up to three couch co-op partners) to strap into spider tanks and take these bloodthirsty creatures out using an arsenal that includes homing missiles, flamethrowers, and nuclear weapons. The twin-stick shooter is also a rogue-lite, which means every trip through the game’s llama-infested city streets and sewers will be a new one.

You can check the game out on Steam, but it’ll also be an Xbox Play Anywhere title, so you’ll be able to buy it once and play on both Xbox One and your Windows 10 PC.