Jack Oliver serves as a primary pilot for Earth's Blue Fixer defense team, operating the BaldiPrise component of the combined super robot Baldios. His thoughtful and laid-back personality clashes with the emotionally intense, hard-headed demeanor of fellow pilot Raita Hokuto, creating interpersonal tension during operations. Oliver participates in the combination sequence where BaldiPrise merges with Marin Reigan's Pulsar Burn and Raita's CaterRanger to form the complete Baldios unit. He repeatedly engages the invading S-1 forces commanded by General Gattler and Commander Aphrodia, utilizing Baldios's subspace travel capabilities to counter attacks from the Aldebaran Army. His combat history includes defending Earth against S-1's catastrophic events, such as artificial suns melting the polar ice caps and subsequent global tsunamis that devastated the planet. Oliver remains an active participant in Blue Fixer's efforts throughout this conflict.