Chapter 3 is the third episode in the Final Space series. It premiered on March 5, 2018 and online on February 26, 2018.
Gary tries to hide Mooncake safely away on the planet Yarno. But instead, Gary and Avocato are trapped in a terrifying mind-puzzle, while Mooncake is taken from them, and forced to fight in a combat arena called the Deathcropolis. Quinn continues to investigate the mystery of the gravitational disturbance.
- The scene where Chuck overrides Quinn's ship and shows an animation on her display saying, "Ah, ah, ah. Didn't say the magic word." and waving a finger is a reference to the scene in the 1993 film Jurassic Park where Dennis Nedry hacks the park's security grid and displays the same message and similar animation.