Apple TV's hit series Shrinking has big plans - and major changes - in store for season 4, which has led some viewers to theorize that Harrison Ford won't be returning as a main cast member. Shrinking, which premiered in 2023, stars Jason Segel as Jimmy, a grieving therapist who decides to become more involved in his patients' lives. Ford, 83, plays Paul, a senior therapist and colleague of Jimmy's who has Parkinson's disease. Over the years, creator Bill Lawrence has made it clear that he had a three-season vision for the show.