Based on the Vertigo Comics, FOX' drama "Lucifer" follows the adventures of Lucifer Morningstar as he helps Detective Chloe Decker with her cases. Over the three seasons, fans have watched the dynamic between Chloe and Lucifer turn into a meaningful friendship and a deep partnership, but the series has never shied away from the will-they-won't-they drama. He often reflects on his personal issues with his family and his past through the cases he lends his special skill set to.

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Along the way Lucifer has made a number of allies, who sometimes serve as his enemies: his therapist Dr. Linda Martin, demon and friend Mazikeen, and his brother Amenadiel.

Season three introduced a new Lieutenant to shake up Lucifer's professional, and personal, life in the form of Tom Welling's Marcus Pierce who was revealed to be Cain, the world's first murderer. The last few episodes have taken a sinister turn as Lucifer broke his deal to help Pierce to finally die, and Pierce went to Maze to deliver a plan that was revealed in Monday's episode.

The FOX drama stars Tom Ellis as Lucifer, Lauren German as Chloe, Kevin Alejandro as Dan, D.B. Woodside as Amenadiel, Lesley-Ann Brandt as Maze, Rachael Harris as Linda, Tricia Helfer as Charlotte, Aimee Garcia as Ella, Tom Welling as Pierce, and Scarlett Estevez as Trixie.

A shocking proposal on the way

Following the fall-out from Monday's episode, fans can expect Lucifer to grow more jealous over the relationship between Chloe and Pierce.

Revealed in the April 23 episode promo, in a shocking move, Pierce will be proposing to Chloe. The real question isn't what drove him to propose, but will Chloe say yes? After she took a chance and said "I love you," Pierce broke her heart, which he'll spend next episode trying to apologize for.

The promo shows Chloe finding roses on her car with a note. Don't expect Pierce to woo her back so easily, especially with a jealous Lucifer attempting to divert her attention away from her relationship as the two work the murder case of a prima ballerina.

The episode called "Anything Pierce can do I can do better," will find Chloe confronting Lucifer about meddling in her relationship while Lucifer discovers something that could change everything just as he's preparing to make a confession. Elsewhere in the episode, Maze is refusing to leave a task that Pierce asked her to quit and Amenadiel turns to Charlotte for help. Fans can expect to find out what happens next now that Pierce no longer has the mark after he gave up his chance to keep from hurting Chloe.

In the season finale, "All Hands on Decker" Chloe begins to rethink a life-changing decision while Charlotte and Maze have a difference of opinion over Chloe's party. Lucifer reluctantly works with Dan on a murder case that brings them to a dog show after Chloe takes some time off work. Based on the description of the episode it's safe to assume what Chloe's answer will be, but that answer may not stick by the end.

Standalone Ella episode

Charlyne Yi has been cast in a rather unusual role. Yi will guest start in a standalone episode of "Lucifer" which will film during the spring and will air as part of a potential season 4. Yi will play Ray-Ray, a long-time friend to Ella with an invisible twist. Ella is the only who can see her.

The season finale of "Lucifer" will air April 30 on FOX.