Evacuation is Evolve's answer to Left 4 Dead's campaign mode. Colonization of the planet Shear has gone to shit, because, you know, it's infested with evolving super-monsters. The colonists decided it's time to hoof it, but the Goliath and Kraken beasts would much rather munch on their crunchy, human bones. In Evacuation, you're working towards one goal: Get the colonists off the planet. As either the hunters or the monster, you'll play four consecutive, random matches - concluded by the MOBA-style Defend map - to determine if the humans escape successfully or get ripped to shreds.
As you win or lose each match, the result affects the next map. The monster wiping out the hunters in a match can result in the destruction of a weather control station, causing more man-eating plants to grow in the next environment. On the other hand, the hunters can pull out a victory and inspire colonists to take up arms against their aggressors and assist them in the next mission. Each map has variables that make one each match feel different than the last, and the whole mode, like all of Evolve, can also be played offline as a simulated, solo campaign.