One mistake with Morgan could lead Mindy to a lifetime of happiness.
According to Morgan, anyone who sleeps with him will find the love of their life immediately afterward. Curious to test this theory, Mindy takes Morgan up on his offer, but backs out at the last minute, humiliating Morgan and prompting him to sue Mindy for sexual harassment. In order to get out of the lawsuit and get back into Morgan's good graces, Mindy makes him an offer he can't refuse.
Casey's new passion calls the doctors to a music festival.
After returning from Haiti, Casey (guest star Anders Holm) has an identity crisis and thinks being a disc jockey might be his new calling. When Mindy and the office go to a music festival for their "work retreat" to see Casey perform, the substance-filled surroundings lead to a series of disasters. Meanwhile, back in New York, Jeremy hires a new doctor (guest star Adam Pally), whom Mindy doesn't particularly like after he saves the day during an emergency delivery.
It's Lahiri vs. Leotard.
As Mindy adjusts to her long-distance relationship with Casey, she also must adjust to the fact that she is no longer the office's "Dr. L" - her office, patients and dignity have been overtaken by Dr. Paul Leotard (guest star James Franco) - so she challenges Paul to get her former life back. Meanwhile, Danny has a new extracurricular activity following his breakup with Christina.