Game of Thrones” actor Gethin Anthony is set to play Charles Manson on NBC’s new drama “Aquarius” starring David Duchovny.

Grey Damon (“Twisted”) has also joined the cast of the new event series.

The 13-episode “Aquarius” is being written by John McNamara and focuses on Duchovny’s character, a cop who goes undercover to track Manson. Damon plays Duchovny’s partner.

Anthony was last seen as Renly Baratheon in the first two seasons of “Thrones.” He is repped by Management 360 and United Agents. News of Anthony’s casting in “Aquarius” was first reported by TVLine.

Damon is repped by Paradigm and Toni Benson.