Episode 3 is the third episode of Girls Planet 999. It was aired on August 20, 2021.
The current cell rankings are displayed at the beginning of the episode. The contestants begin preparing for their first mission by determining their positions in the performance.
Several days before the team performances, a dance battle is held to determine the order in which the teams will perform. Following the dance competition, the teams continue to practice, with the mentors offering feedback on how to improve.