In the 1985 film "Commando," the mercenary who fights John Matrix is Captain Bennett. Vernon Wells plays Bennett, a former member of Matrix’s team who turns against him and helps kidnap Matrix’s daughter, Jenny.
Bennett works for Arius, a former dictator whom Matrix previously removed from power. Arius forces Matrix into a political assassination plot by threatening Jenny’s life, while Bennett acts as both a field commander and Matrix’s personal nemesis. The film establishes that Bennett was discharged from Matrix’s unit for excessive violence and later faked his death.
After Matrix kills Arius and rescues Jenny, Bennett takes the girl into the villa’s basement. This leads to the film’s final confrontation, in which Matrix and Bennett fight among pipes and machinery. Matrix ultimately kills Bennett by impaling him on a steam pipe.
The other names can cause confusion because Cooke and Sully are also members or associates of the mercenary operation, while Arius is the political leader behind the kidnapping. Bennett is the specific mercenary and former teammate who serves as Matrix’s principal physical rival.