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Left vulnerable after Omen's attack, the royal heirs look to conceal their damaged ship but are soon confronted by the bounty hunter Magmatron.
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Aja and Krel enlist Stuart to help find their former ally, who’s being held prisoner at a bounty hunter outpost on the moon.
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With General Morando's invasion of Earth imminent, Krel tries to stop the fleet's advance with unwitting help from the kids of Arcadia.
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Mother, the AI controlling the royals’ ship, reflects on keeping the peace between her quarreling family. Morando discovers a secret hidden on Earth.
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Colonel Kubritz stages a phony quarantine of Arcadia High School in a ploy to capture the royals – and their advanced weapons technology.
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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.
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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.
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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.
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The last defenders of House Tarron face off against General Morando and his army of Omen robots in an all-out battle for survival.
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With General Morando searching for Gaylen's Core, Aja and Krel must travel into their parents' subconscious to learn the core's location first.
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After learning the location of Gaylen’s Core, Toby calls Trollhunter Jim Lake, and Blinky advises the royals to consult the Soothscryer.
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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.
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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.