The official trailer for The Belko Experiment opens with a day at the office at Belko, a non-profit organization that facilitates American companies in South America. A mysterious voice takes over the intercom, and tells the employees their "task" - that they must kill three coworkers or else they will kill six others.
Mike (John Gallagher Jr.) tells the annoyed group that they need to evacuate the floor. Panic ensues as the office witnesses a gruesome attack. Whoever is holding them hostage has the power to detonate the explosive trackers implanted inside the worker's heads. Tensions rise as the Belko employees decide whether to follow the voice’s instructions to kill, or be killed themselves.