A man named Tim Templeton tells a story about his 7-year-old self and his parents, Ted and Janice. One day, Tim is surprised when an infant wearing a business suit arrives at his house in a taxi, and Ted and Janice call him Tim's little brother. Tim is envious of the attention the day-old baby receives, not to mention suspicious when the infant acts odd around him. Soon, Tim learns that the baby can talk like an adult, and he introduces himself as "The Boss". Seeing an opportunity to get rid of him, Tim decides to record a conversation between the Boss Baby and other toddlers who are at Tim's house for a meeting. The Boss Baby and the other infants catch Tim with the recording, and the cassette tape is terminated after the Boss Baby threatens to tear up Tim's favorite stuffed animal, Lam-Lam. With no evidence to support him, Tim's parents ground him for three weeks..