 The military leaders among the colonists set up an attack force to defend the colonists using state of the art fighter ships identified as the Icarus.The main operation of attack is called "Acrobat Mission" because it exceeds the technical flying ability of the pilots.In the arcade version, surviving fighter pilots "Jet" and "Nova" are available for the player to choose for the rest of the game, but both were removed from the Super Famicom version, making the player's pilot anonymous as well as discarding Nova's custom color scheme.