A world war comes to an abrupt halt when an advanced, abandoned alien fortress crash-lands on Earth; ten years later, an international effort rebuilds the ship into the SDF-1, but aliens called the Zentraedi interrupt its launch by staging an attack.

The Earth's SDF-1 Battle Fortress prepares to lift off into space to battle with the alien invaders.

In order to avoid the total destruction of the Earth, the crew of the SDF-1 make an untested jump into hyper-space.

Rick and Minmei find themselves trapped inside an unexplored area of the gigantic Space Battle Fortress.

Captain Gloval plans a daring strategy to convert the SDF-1 into a robotic configuration to do battle with the Zentraedi forces.

The battle between the Robotech defenders and the Zentraedi is taken to the very limits of the Solar System as the two forces meet in the rings of Saturn.