In ZMR, portals have opened into alternate dimensions, unleashing zombies, monsters and, yes, robots. Up to eight players band together to stop the advancing hordes across multiple game modes, including a campaign and wave-based survival. Alternatively, if you can't - or don't want to - beat 'em, join 'em by playing competitively; the game also features a 16-player head-to-head mode where teams are split into monsters vs. humans.
Polygon reports that EnMasse plans to roll out extra content after the game is launched, including "Dino Island" DLC which features an map inhabited by dinosaurs with guns on their backs. Screenshots released for the game show off plenty of other baddies as well, so place your bets on which creature will be your undoing. Personally, we vote death by merman.