Mr. Church reunites the Expendables for what should be an easy paycheck, but when one of their men is murdered on the job, their quest for revenge puts them deep in enemy territory and up against an unexpected threat.

A scientist enlists the help of the US army to investigate the mysterious disappearance of her father deep in the Belizean jungle, but she gets caught in the crossfire between a brutal guerrilla army and giant mutated wasps.