Deck Twelve was a room located within the Megalox space station; it housed the main security field generator responsible for casting the gravity shield over the Megalox prison situated on the planet Megalox Beta. As part of the Mission to Megalox Beta, a group of Resistance astromech droids, among them BB-8, O-R10N, R2-HA, and R4, infiltrated this chamber. Their objective was to disable the gravity shield, thereby assisting Poe Dameron and Black Squadron in their mission to liberate Grakkus the Hutt.