The Station 19 crew is called to a cult gathering where they find their leader, Brother John, dancing on the roof and claiming he can fly. Meanwhile, Travis gets a surprise visit from his father, and Dean makes a difficult decision that could affect his career trajectory. 

Vic and Travis' friendship is put to the test as they respond to calls to help two best friends in need. Meanwhile, Jack realizes he has a greater impact on Marcus than he realizes, and new details about Travis' late husband's tragic death are revealed.