Uchû keiji Gyaban: The Movie

Fifteen years back, three friends from childhood—Geki, Sherry, and Okuma—were inspired to explore space while stargazing. As they grew up, Geki and Okuma embarked on a mission to Mars, but their shuttle vanished before arriving at the planet. A year after this incident, a monster emerges, and a mysterious warrior clad in silver makes an appearance.