Framed for a corporate crime, an adult Ted Templeton turns back into the Boss Baby to live undercover with his brother, Tim, posing as one of his kids.

Theodore Templeton is framed for embezzlement and forced to revert back to his old Boss Baby self and crash with his brother Tim and his two nieces, brainy big kid Tabitha and fellow Baby Corp employee Tina. Together, Boss Baby and Tina co-lead a new Field Team fighting to increase Baby Love while keeping a new group of arch-nemeses - The Uncuddleables - from destroying Baby Corp itself.