Mr. Peabody went from adoption agent to principal to dentist.
At first he thought that Junior was innocent, but found out he was wrong about Junior as he conned Ben and Flo into adopting Junior.
After moving to Mortville, he took a job as a principal. Peabody is mean to his students and only wants to be principal, because he hates children. He is horrified to see Junior again, but calls him a genius, and sends him to the 6th grade. He is also seen at Junior and Trixie’s favorite restaurant with some lady. “Pizza-Rific” where they’re engaged in a food fight between Mr. Peabody, Junior, Trixie, Ben, & Annie.
After becoming a dentist, he gives Junior braces, but all Junior had was a broken tooth and Peabody replaced Junior's x-rays with a horse's. Junior gets revenge by dousing Peabody and his assistant Nurse Kiki with laughing gas which knocks them unconscious. Afterwards, Peabody wakes up wearing braces and dangling from the ceiling fan from his braces and Nurse Kiki also wearing braces and tied to the patient chair.