Left vulnerable after Omen's attack, the royal heirs look to conceal their damaged ship but are soon confronted by the bounty hunter Magmatron.
Aja and Krel enlist Stuart to help find their former ally, who’s being held prisoner at a bounty hunter outpost on the moon.
With General Morando's invasion of Earth imminent, Krel tries to stop the fleet's advance with unwitting help from the kids of Arcadia.
Mother, the AI controlling the royals’ ship, reflects on keeping the peace between her quarreling family. Morando discovers a secret hidden on Earth.
Colonel Kubritz stages a phony quarantine of Arcadia High School in a ploy to capture the royals – and their advanced weapons technology.
Stuart gets an unexpected visit from his ex-girlfriend. Krel helps Toby and Eli produce a short film, “Kleb or Alive,” for a local contest.
Unable to stop an asteroid 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 whole before it can be tested further.
The last defenders of House Tarron face off against General Morando and his army of Omen robots in an all-out battle for survival.
With General Morando searching for Gaylen's Core, Aja and Krel must travel into their parents' subconscious to learn the core's location first.
After learning 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 an armored Kubritz, makes plans to lure out the royals.
With the fate of the universe at stake, the royal heirs and their allies must gather their forces for the ultimate battle to defeat General Morando.