Gary is carrying out the final days of his prison sentence aboard the Galaxy One when he meets Mooncake, an alien who is being chased by bounty hunters. Gary swears to keep Mooncake safe, not knowing the alien is a planet-destroying super weapon.

Gary and Avocato must chase down the ruthless bounty hunter Terk, before he can tell the Lord Commander that Mooncake is aboard the Galaxy One.

Gary tries to hide Mooncake safely away on the planet Yarno, but he and Avocato find themselves trapped in a terrifying mind-puzzle. Mooncake is forced to fight in a combat arena called the Deathcropolis.

Gary has to harvest energy from a nearby star to reignite the Galaxy One's hacked engines, however radiation poisoning from the star sends Gary into a trance of painful memories.

Quinn realises the only people she can trust are Gary and the crew of the Galaxy One. Meanwhile, as the gravitational disturbance grows, Gary, Quinn, and Avocato's investigation takes them to a bizarre bioluminescent planet.

Gary goes on a mission to save Avocato's son, Little Cato, from Lord Commander's Prison Planet, but it turns out to be a trap; Quinn sees Gary's vlogs.