The Templeton family is now made up of four, Tim, his parents, and his new baby brother, Theodore (aka, The Boss Baby). thier just a heart shaped family with a perfect, happy life, but back at Babycorp, a baby that looks exactly like Tim is assigned, by the machine, to a family, Tim's family that is. when the new baby makes it's arrival, Tim's attention for his little brother Theodore becomes more difficult and low, thanks to the new baby. Jealous much Boss Baby?