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Personality Crisis is the fifth episode of the first season of Limitless.
After recovering all of the files the FBI has on NZT which includes information about suspected users past & present, one of whom is Rebecca’s late father, Brian very badly wants to tell her but worries that telling her will land him in a supermax prison. He keeps himself from telling her by making videos from his NZT self to his non-NZT self. Also, Brian accidentally meddles in Rebecca's personal life while learning self-defense from her secret boyfriend, FBI Agent Casey Rooks (who incidentally does not know about NZT), by making him suspicious about how Brian was able to pick up self-defense technique so quickly.