Miner Nathan Mallstrom finds The Teather, an ancient artifact that links Earth and Dark Earth, and unwittingly brings demons to Earth. Summer Vale and Bulo arrive to save the day, but are left with more questions than answers.

Cornered by the demon Rosemary, Nathan is aided by Davidath who has brought with him The Trankartak, an ancient black sword. The weapon arrives just in time as Summer is put to the test.

Bulo takes Nathan to visit Weeber for help with the new powers. Weeber shows Nathan how to channel The Teather as the team goes on a hunt without Summer.

Sckraab, ruler of Dark Earth, reveals he will go to any length to conquer and rule both Earths. Meanwhile, Summer is rocked to discover what she must do to stop Sckraab and his minions.

Summer, Nathan and the team must pull together for the battle of a lifetime. This fight will decide the fate of two worlds!