CW | 9:00 pm
Season 4 of this sci-fi series opens with "Someone Has to Rule," and that someone, Garret (Jake Stormoen) hopes, will be Talon (Jessica Green. Meanwhile, a mysterious assassin seeks revenge. Elsewhere, Falista (Georgia May Foote) mourns for Tobin (Aaron Fontaine), while still having the presence of mind to hatch a new scheme. Zed (Reece Ritchie) uncovers a secret about Wren (Izuka Hoyle), whom he wants to be High Priestess.