Space Cop Gavan The Movie

"Jouchaku, you who inherit the silver spirit―― when the galaxy is in danger, the Space Sheriff will rise up."

Fifteen years ago, three childhood friends, Geki, Sherry and Okuma, were star-gazing and became inspired to go into space. As adults, Geki and Okuma join a mission to Mars, but their space shuttle goes missing before they could reach their destination. A year later, a monster attacks and a mysterious silver-colored warrior appears.