Watch ‘The Simpsons’ Guest Star Matthew Modine, Channeling His ‘Stranger Things’ Character,  Diagnose Bart as a ‘Psycho’ in Sunday’s Episode (EXCLUSIVE)
Update: 2025-10-30
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Matthew Modine joins The Simpsons in a unique role, playing a psychologist who tries to help Bart and Homer's strained relationship. In the flashback episode Bad Boys... For Life?, Modine's character, Dr. Leonard Stern, takes drastic measures after witnessing Bart's mischief, leading to a court order to take Bart away. This episode marks a milestone for showrunner Al Jean, who is stepping down after years of service, making it a significant episode for fans to watch.
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