Wren is invited to a Halloween party by her crush, Aaron Riley, but she is also forced by her mother to take her oddball little brother Albert with her when she goes out trick-or-treating on Halloween. When she goes to the party instead, she loses him and must find him before her mother finds out.

When an unexpected enemy emerges and threatens global safety and security, Nick Fury, director of the international peacekeeping agency known as S.H.I.E.L.D., finds himself in need of a team to pull the world back from the brink of disaster. Spanning the globe, a daring recruitment effort begins!