Gates Capa was first seen serving as a wing-mate for Rosamia Badam while testing out their Baund Doc prototypes at Side 2, with Gates piloting prototype unit one with Loren Nakamoto as the on-board operator. During this test mission, Rosamia runs off with Kamille Bidan into one of the colonies and Gates pursues them, and ends up fighting Kamille up close before having to bring Rosamia back. He is later seen escorting the further-enhanced Rosamia piloting her MRX-010 Psyco Gundam Mk-II with him in his own Baund-Doc. While Rosamia is searching for the Argama, Gates ends up trying to defend the Dogosse Giar from Reccoa Londe's squadron, but when Rosamia was finally killed, Gates suffered some type of mental lapse before the Dogosse-Gier is destroyed. His fate remains unknown. (Source: Gundam Wikia)