The SDF Sirius Platoon engages on a mission to rescue hostages; they begin receiving distress calls from trains near route 309; the SDF Platoon is sent to investigate the cause of these events on an unusual planet.

The Galaxy Express 999 crash-lands on a strange planet; Sirius platoon arrives to discover the shield protecting the planet has been stretched by mysterious hands.

Due to a mysterious drifting space seed, the Alta Line Express 637 is now stuck; while trying to reach the ship, a beam emerges.

During the pursuit, the 641 ignores a call from enemies in the main battleship; Big One appears to rescue the 641 in time, only to learn that a civil war may be brewing below on planet Guerra.