Lucifer Morningstar (Tom Ellis) stars in the newest “Believe Me” teaser from “Lucifer” Season 2. FOX

Lucifer” has unveiled the title for Season 2, episode 6, according to Spoiler TV.

Just recently, the writers of the hit FOX series posted a photo of the script for episode 6 which confirms that its title, "Monster." New cast member Tricia Helfer, who will be playing Lucifer's mother Charlotte, also retweeted the same snap. The image also confirmed that the upcoming episode was written by Chris Rafferty and directed by Eagle Egilson.

There are no other details released regarding “Monster,” but there's already some speculation about the plot of the installment.

Some fans think the title could be a hint that something bad will happen in episode 6, while others believe that Chloe Decker (Lauren German) and Lucifer Morningstar (Tom Ellis) could have another falling out. In season 1, the two characters lost their trust in each other after Chloe accused Lucifer of a crime he didn't commit. Another fan speculation suggested that the episode might not have anything to do with Chloe and Lucifer's relationship at all and will instead revolve around Charlotte and her two sons.

In other news, “Lucifer” Season 2 will soon see “Buffy the Vampire Slayer” alum Charisma Carpenter in a guest-starring role in the hit FOX TV series.

According to Spoiler TV, the actress will be playing the role of Jamie Lee Adrienne, a sexy and sultry woman who loves to party and enjoys socializing. But although she's married to a former action star and it seems like she has everything in life, Jamie isn't truly happy and content. There's more to her than meets the eye as she's hiding a huge secret that will be unveiled in "Lucifer" Season 2, episode 5.

Following her casting, Carpenter shared a series of photos from the set of “Lucifer” Season 2 on her Instagram account. One of the photos was of Lucifer’s chair, while the second photo was of her and “Lucifer” lead star Ellis.

“Lucifer” Season 2 will premiere on Sept. 19 at 9 p.m. ET on FOX.