Millennium Films also revealed a synopsis for the film with a possible spoiler alert:
The Expendables are back and this time it's personal! After Tool (Mickey Rourke), the heart and soul of the Expendables, is brutally murdered on a mission, his comrades swear to avenge him. They're not the only ones who want blood. Tool's beautiful young and wild daughter Fiona embarks on her own revenge mission, complicating matters when she is captured and ransomed by a ruthless dictator plotting to destroy a resistance movement. Now Barney and the Expendables must risk everything to save her and humanity.