[posted by wap, platform: Nokia (E71)]

去gamefaqs查查看？觉得那里这种老游戏的攻略挺全的。

¤ Before you reach a CHALLENGING STAGE, let a GALAGA COMMANDER beam one of
  your FIGHTERS up. When it attacks you while carrying your CAPTURED FIGHTER
  (shown in red), shoot at the GALAGA so that it drops your CAPTURED FIGHTER.
  Now you have TWO fighters on the same team thus double the firepower. This
  really helps in the CHALLENGING STAGE.
照他试了一下，貌似也不对
似乎是完全随机的。