On the run from Nacelle and Rosemary, Nathan heads into town to seek his sisters help. Ending up cornered by Rosemary, Nathan is aided by Davidath who is injured in the confrontation. While Summer battles Rosemary, Davidath is brought to Gwen's Clinic to try to save his life, where he reveals he has something for Summer; The Trankartak. An ancient black sword that steals the life force of it's victims and grants it to it's wielder, Summer soon has to put her new weapon to the test.

Summer returns to Paris to meet with her contact while Nathan and Bulo handle things in Nickel City. After placing a protective shield around Gwen's Clinic, Nathan finds out he may need some help with his new powers. Bulo offers a trip to see an old friend who might be able to help, Weeber. When removing The Tether doesn't work, Weeber thinks of a way for Nathan to control it instead and not a second too late as the team has to go on a hunt without Summer.

Sckraab, ruler of Dark Earth, arrives to put into place the final pieces he needs to enact his plan. He desires to bring his armies over using The Teather to conquer and rule both worlds. His true evil Is revealed as he shows exactly how far he is willing to go to make this a reality. Summer discovers her true origin and comes to terms with the role she must play in stopping Sckraab and his minions.