Lucifer Morningstar, the former Lord of Hell, continues his life on Earth in Los Angeles, working with the LAPD as a consultant alongside Detective Chloe Decker. Their partnership deepens as they solve crimes together, but their personal relationship becomes complicated when Chloe finally learns the truth about Lucifer’s divine nature. Struggling to process this revelation, Chloe distances herself, leaving Lucifer confused and hurt. Meanwhile, a mysterious priest tries to convince Lucifer to return to Hell, warning of impending chaos if he stays on Earth.
Eve, the original sinner and Adam’s ex-wife, arrives in Los Angeles, drawn by Lucifer’s rebellious nature. She quickly becomes infatuated with him, encouraging his darker impulses and causing tension between him and Chloe. Lucifer enjoys the distraction Eve provides, but his feelings for Chloe remain unresolved. Meanwhile, Amenadiel, Lucifer’s angelic brother, faces his own crisis as he grapples with losing his powers and adjusting to mortal life, finding unexpected guidance from the demon Mazikeen.
The dynamics grow more chaotic as Lucifer’s twin brother, the angel Michael, secretly arrives on Earth, manipulating events to sow discord. Disguised as Lucifer, Michael creates misunderstandings and fuels conflicts, particularly between Lucifer and Chloe. Maze, feeling abandoned by her friends, seeks revenge and allies with Michael, further complicating the situation. As tensions rise, Lucifer begins to suspect that something—or someone—is working against him.
Chloe, still reeling from Lucifer’s true identity, teams up with Dr. Linda Martin and Ella Lopez to understand celestial beings better. Linda, who has been counseling both Lucifer and Amenadiel, helps Chloe navigate her fears and doubts. Meanwhile, Dan Espinoza, still grieving Charlotte’s death, becomes increasingly suspicious of Lucifer and his connection to the criminal underworld. The group’s investigations lead them closer to uncovering Michael’s deception.
The season reaches a climax when Lucifer and Chloe finally confront Michael, exposing his schemes. In a desperate bid to protect Chloe, Lucifer makes a heartbreaking decision—to return to Hell and rule once more, believing it’s the only way to keep Earth safe. As he says a tearful goodbye, Chloe confesses her love for him. The season ends with Lucifer ascending to his throne in Hell, determined to become a better king, while Chloe and the others vow to find a way to bring him back.