Wythers (guest star Andrew Howard) hatches a plan to save Garret (Jake Stormoen) before it is too late. Gwynn (Imogen Waterhouse) responds to Tobin's (guest star Aaron Fontaine) proposal. Meanwhile, Talon (Jessica Green) and Zed (guest star Reece Ritchie) discover a key to great power. Lastly, Garret heads out on a dark mission.