NBC’s upcoming event series “Aquarius” has found its young Charles Manson.

“Game of Thrones” actor Gethin Anthony will play the small-time criminal and budding cult leader seeking out vulnerable women to join his “cause,” a network representative told TheWrap.

Additionally, TheWrap was told that “Friday Night Lights” actor Grey Damon and “Bunheads” actress Emma Dumont have also joined the growing cast for the drama.

Also read: David Duchovny to Hunt Charles Manson in NBC’s ‘Aquarius’

They join the show’s lead, “X-Files” star David Duchovny, who will play Det. Hodiak, an L.A. police sergeant who’s tracking the young Manson.

Damon will play Hodiak’s new partner, whose skills are described as a good match for Hodiak. Meanwhile, Dumont will play Young Emma Karn, a woman who goes missing after joining Manson’s ranks.

Writer John McNamara (“In Plain Sight,” “Profit”) will executive produce with Duchovny along with Marty Adelstein (“Prison Break,” “Last Man Standing”) and Melanie Greene.

Also read: Jack Coleman to Return for NBC’s ‘Heroes Reborn’

NBC ordered 13 episodes in March of the series produced by ITV Studios America in association with Marty Adelstein Productions.

TVLine first reported the castings for Anthony, Damon and Dumont.