Ice Planet

In the brief period of peace after a terrible war in a far-future Earth, an outer-space military academy is attacked by an unknown, unstoppable alien force. The commander of the academy and a group of newly-graduated cadets escape to a large research station. Pursued by the aliens, the station jumps through a mysterious hyperspace gateway that sends them to a planet in an unknown part of the universe. Where are they? Will they ever be able to return to Earth?