Upon leaving hell, Lucifer Morningstar retreats to Los Angeles for a more exciting life. When the murder of a friend connects him with LAPD detective Chloe Decker, Lucifer becomes intrigued with the idea of punishing criminals, sending the devil himself into a struggle between good and evil.

Loony Lucifer and cartoon Chloe find themselves trapped in an animated loop. Amenadiel prepares for his new job. Dan returns to the city of angels.