Marshall Seymour is a divorced executive at a Chicago department store, struggling to balance his demanding job and his relationship with his 11-year-old son, Charlie. After returning from a business trip to Thailand, Marshall unknowingly brings back a mystical skull with the power to switch the souls of two people who touch it and make a simultaneous wish. During a heated argument in Marshall's office, they accidentally activate the artifact, causing them to switch bodies.

The sudden change throws both of their lives into chaotic disarray. Charlie, now in the body of his father, must navigate the complexities of running a department store while dealing with adult responsibilities and relationships. Meanwhile, Marshall, trapped in the body of a child, grapples with the trials and tribulations of middle school life. As they experience each other's daily challenges and routines, they begin to understand and appreciate the pressures and difficulties each faces, prompting a newfound mutual respect.