Left vulnerable after Omen's attack, the royal heirs look to conceal their damaged ship, but they are soon confronted by the bounty hunter Magmatron.
Aja and Krel enlist Stuart to help them find their former ally, who is being held prisoner at a bounty hunter outpost on the moon.
With Gen. Morando's invasion of Earth imminent, Krel tries to stop the fleet's advance, with unwitting help from the kids in Arcadia.
Mother, the AI controlling the royals' ship, reflects on keeping the peace between the members of her quarreling family; Morando discovers a secret hidden on Earth.
Col., Kubritz stages a fake quarantine of Arcadia High School in a ploy to capture the royals -- and their advanced weapons technology.
Stuart gets an unexpected visit from his former girlfriend; Krel helps Toby and Eli produce a short film, "Kleb or Alive," for a local contest.
Unable to stop an asteroid that is hurtling toward Earth, Kubritz pleads with the royals to help destroy it by offering stored alien technology from Area 49B.
Krel builds a prototype device that will create a wormhole back to Akiridion-5, but Luug swallows it before it can be tested further.
The last defenders of House Tarron face off with Gen. Morando and his army of Omen robots in an all-out battle for survival.
With Gen. Morando searching for Gaylen's Core, Aja and Krel must travel into their parents' subconscious to first learn the core's location.
After discovering the location of Gaylen's Core, Toby calls Trollhunter Jim Lake, and Blinky advises the royals to consult the Soothscryer.
As the town of Arcadia gathers for the premiere of "Kleb or Alive," an army of Omens -- led by armored Kubritz -- makes plans to lure the royals out.
With the fate of the universe at stake, the royal heirs and their allies must gather their forces together for the ultimate battle to defeat Gen. Morando.