Returning to Penn
The twins and Mac attempt an academic comeback.
Supporting source ↗CASE FILE · S18 E03

Dennis and Dee are diagnosed with ADHD, and even more shocking: Mac isn't. They go back to school for a do-over now that they understand their brains more better.
THE SHORT VERSION · SPOILERS AHEAD
The twins and Mac attempt an academic comeback.
Supporting source ↗Charlie leaves before researchers announce their conclusion.
Supporting source ↗Frank pushes Jie into a dangerous movie-inspired stunt.
Supporting source ↗Nobody enrolled, so nobody receives grades.
Supporting source ↗THE EVIDENCE
Charlie wears a wired cap during further assessment.Source ↗
Dee studies with Dennis in the library.Source ↗
Dennis takes the examination beside Dee.Source ↗
Frank coaches Jie on the high diving platform.Source ↗
Johnny confronts Frank beside Madison.Source ↗
Larry quizzes Mac using study cards.Source ↗
Professor Lee questions Charlie about the image test.Source ↗
The psychology professor addresses the lecture hall.Source ↗
The gang compares its results around the bar.Source ↗
The diving tower rises above the outdoor pool.Source ↗
Dennis and Dee enter the university lecture hall.Source ↗
Charlie examines a page of photographic image questions.Source ↗
A coffee can sits between Charlie and the researchers.Source ↗
Dee admits she is on crack.Source ↗
Study cards pile up beside Mac and Larry.Source ↗
A labeled security feed records the dean’s office intrusion.Source ↗
Dennis sabotages Mac with candy in his ear.Source ↗
Jude Cole’s song closes the episode.Source ↗
The song accompanies the study-and-training montage.Source ↗
Frank models the diving stunt on the film.Source ↗
The twins’ ADHD results are positive; Charlie’s remain inconclusive.Source ↗
Tags document researched occurrences, not every appearance. Read the research notes and attribution.