In the midst of recovering from their successful if casualty prone first mission, the crew of the Alliance Space Ship Vorpal Blade are suddenly scrambled back into action. All other priorities take second place as word arrives on earth of a gate colony which has fallen to an unidentified alien assault. As the only space ship currently available to the Human-Adar Alliance, the Vorpal Blade is dispatched to find out what happened to the colony, rescue any survivors and learn the identity of the attackers.