He Who Dares: Downing Street Siege is an action-packed movie about a group of masked terrorists who attempt to take control of Downing Street, where the Prime Minister resides. The film follows a team of skilled law enforcement officers as they race against time to save the Prime Minister and prevent a massacre. The plot is filled with suspense, thrilling action sequences, and unexpected twists.

A group of ex-soldiers forms a team and impersonates police officers to exact revenge. They go on a mission involving bank robberies, terrorism, and an assassination attempt. The plot takes a dark comedic twist as they face various challenges and encounter unexpected obstacles.