Anexperimentaldrugthatissupposedtoreduceaggressionhastheoppositeeffectonababoonthatisbeingexperimentedonbyagroupofmedicalstudentsandtheirprofessor.Whiletheyareplayingafantasyrole-playinggameintheirresearchfacility,thebaboonescapesandbeginshuntingthemdown.