As DC moves forward with its live-action Titans, the expanding cast has added Castle veteran Seamus Dever in a mysterious role.

Written and created by an all-star team of Akiva Goldsman, Greg Berlanti, and DC boss Geoff Johns, fans are hoping that the first live-action adaptation of the Teen Titans stories will be as big a hit as The CW’s juggernaut that is the Arrowverse. Hoping to celebrate one of the most popular teams in the world of comic books, it looks like a long-awaited Titans movie will have to make to with the small screen for now. However, with an already impressive cast and rumored character additions, we’re sure fans can cope.

Deadline broke the news, reporting that Dever will be a recurring character, but didn’t go any further to specify just what role that would be. Although we don’t know who Dever will be playing, he is joining Brandon Twaites as Dick Grayson/Nightwing, Anna Diop as Koriand’r/Starfire, Teagan Croft as Raven, and Ryan Potter as Gar Logan/Beast Boy.

With Titans focussing on a young crop of heroes coming to terms with their responsibilities, Dever is a little too old to be playing one of the team, and with the big bad of season 1 confirmed to be an African American version of Acolyte, it is anyone’s guess what Dever’s part could be. Given that the main crop of heroes are all accounted for, it is a fair assumption that Dever will be some sort of villain to face Thwaites’ motley crew of vigilantes.

It is going to be a busy time for the 41-year-old, who is already set to appear in the second season of FX’s Legion. Away from superhero TV shows, his varied CV boasts bit parts in Mad Men and Charmed, as well as larger roles in Army Wives and General Hospital. However, across 173 episodes of Castle, it was his eight-season stint as Detective Kevin Ryan on ABC’s hit show that he is known best for.

After rumors of a Titans series began in 2014, the show was originally slated for TNT before later being announced for DC’s upcoming streaming service. Considering that the team was first introduced back in 1964, there is plenty of source material to keep the show running for years. Also, with Marv Wolfman and George Perez’s acclaimed run of The New Teen Titans hitting shelves in the ’80s, there are hopes that favorites like Cyborg and Deathstroke may eventually find themselves on the show or tie into an Arrowverse crossover. Either way, the first run of 13 episodes is sure to be just the start of Titans and an ambitious new project for the world of DCTV.

Titans debuts in 2018 on the DC-branded direct-to-consumer digital service, operated by Warner Bros. Digital Networks.

More: DC’s Titans: Robin Flashbacks May Include Batman Appearance

Source: Deadline