An adult named Timothy "Tim" Templeton narrates a story about his 7-year-old self and his parents, Ted and Janice. Tim has a very lively imagination and is a happy and beloved only child. One night, as his parents tuck him into bed, they ask him how he would feel about a new baby brother. Tim says, "No thanks!", to his parents, then the screen pans out to show that his mom is in-fact pregnant.
Join the fun as Boss Baby and Tim battle pirates, travel through outer space, swim deep into the sea, and go toe-to-toe with some ferocious dinosaurs.
The Templeton brothers, Tim and his Boss Baby little bro Ted, have become adults and drifted away from each other. Tim is now a married stay-at-home dad. Ted is a hedge fund CEO. But a new boss baby with a cutting-edge approach and a can-do attitude is about to bring them together again … and inspire a new family business.