Alex has been captured and Tom, Kyra, and Jack must scramble to find him. As Scorpia shows the power of their new weapon, Invisible Sword, Alex is confronted by Julia Rothman with some uncomfortable truths about his father.

Cast: Otto Farrant, Stephen Dillane, Vicky McClure, Brenock O'Connor, Ronkẹ Adékoluẹjo, Marli Siu, Thomas Levin, Jason Wong, Sofia Helin, Eline Powell, Shelley Conn