Poe Dameron and BB-8 assign newly appointed spy Kazuda Xiono to the Colossus, an aircraft refuelling platform on an outer rim water planet. While undercover, Kaz works as a mechanic and lives with Yeager, a pilot who operates a starship repair shop.

Kaz befriends a sky racer named Rucklin who pressures him to take some rare and dangerous hyperfuel hidden in Yeager's office.

The First Order arrives at the platform for mysterious reasons, and Kaz and BB-8 are determined to sneak into the tower to find out what they want.