Maddie, Caspian and Mist travel to London to meet Olivia; Holstrom continues his quest to be cured of the flaw; SafeSurf develops a mind of its own.

Maddie and Mist try to find and rescue Caspian, who is held hostage until he promises to cure his captor; Ellen and Waxman learn of a plan to destroy humanity from the unlikeliest place.

Caspian and Maddie try to save humanity from Holstrom's virus; Former foes create alliances to help save the world.