Jupiter serves as a commander in Team Galactic, operating under Cyrus alongside Mars and Saturn. She participates in the mission to open a space-time rift above Mount Coronet to retrieve their missing leader. During this operation, Jupiter deploys her Skuntank to guard captured prisoners, including Ash and his friends, preventing their escape. Confronted by Cynthia's Garchomp, she proves unable to counterattack and is captured by Looker and Team Rocket.

Her demeanor is consistently cold and fiercely loyal to Team Galactic's cause. When Looker questions her about the potential destruction of the existing world under Cyrus's plan for a new universe, she dismisses the concern with indifference, stating she would not care if she vanished with the old world. Despite Cyrus's history of disregarding his subordinates, Jupiter persists in the mission to bring him back, demonstrating unwavering commitment to the team's objectives.

Following the operation's failure and Cyrus's permanent departure through the portal, Jupiter is arrested alongside Mars and Saturn. Upon learning of Cyrus's decision to enter the new universe alone, she is visibly stunned, indicating a moment of realization about his abandonment of the team.