Star Fleet

2999: a gigantic Imperial Alliance battlecruiser wipes out the EDF's Pluto Alpha Base and heads for Earth. General Kyle orders X-Bomber to intercept it but the craft is only 90% complete and not up to the task. Badly damaged in the ensuing battle, it crashes on the Moon.

Unable to gain contact with the crash-landed X-Bomber, Lamia attempts to reach the ship and help the crew, but comes under heavy attack from Imperial Alliance fighters.

On their way to Pluto with materials to rebuild the damaged Base, three Star Fleet transport cruisers have mysteriously disappeared. X-Bomber is called in to escort the next transporters. They encounter Imperial Alliance warships, and destroy the alien fleet. But Commander Makara sets a trap, and as X-Bomber attacks the Alliance Base on Jupiter, Orion sends his missiles against Dr. Benn's ship. Shiro, Lee and Hercules take off, using X-Bomber's new weapon Dai-X, to destroy the alien base.

Whilst continuing their protection of the Star Fleet transport cruisers on their mission to Pluto, Shiro tells his fellow crew of X-Bomber that he believes Captain Carter is still alive. Lamia receives a strange message from the space galleon Skull - an unknown voice calling her. She takes off in one of X-Bomber's shuttles to find the Skull. Shiro, Lee and Hercules are sent after her in Dai-X. As Lamia approaches the Skull ship, her shuttle loses power. The Skull is attacked by the Imperial Alliance warship and Lamia calls Shiro to attack the battlecruiser to save the Skull.

Shiro, Hercules and Lee search Pluto for the lost Captain Carter - their former tutor at the academy. Meanwhile, Lamia receives a summons from a mysterious sailing ship, "The Skull".

X-Bomber's new mission to seek out the Skull is put on hold when the Imperial Alliance renews their assault on Earth.