Once Theodore arrives at the Templeton House, his new brother Tim has his suspicions of the new baby. If he were to fail the mission, he would be demoted to a mortal baby and have to grow up. He was one day chosen to go undercover as a normal baby to the Templeton House, to investigate Puppy Co's new puppy. Theodore was born a special baby and, therefore, he was chosen to become a Baby Corp agent. In the end, the brothers finally reconciled. He becomes successful and rich, he's also quite resentful with Tina Templeton, for writing up him and Tim together to stop Armstrong, but reluctantly agrees. In The Boss Baby: Family Business, as an adult, he now becomes a boss. He's very carefree The Boss Baby: Back in Business on Netflix. In the television series, he fights for Baby Corp, his family and friends. He only cares about himself at first, but he cares about others as well, especially his older brother.
His blonde hair makes a swirl over his head. Theodore is a baby with fair skin and green eyes.