Arcade game hit test

I’m building a a space shooter “Defender” type game, and I’m having a problem with the hit test. My laser hits the enemy (which a duplicate). Enemy movie clip goes to it’s frame to which a short explosion animation. The hit test works fine, but since there is more than frame in the “enemy” movie clip, the hit test cycles through every frame of the “enemy” clip until it passes through it’s boundries. Is there a way to only have it hit test with only the first frame of a movie clip?

This is the script on my laser movie clip that performs the hit test:

if(this.hitTest(_root[“enemy”+i])){
_root.score+=100;
_root[“enemy”+i].gotoAndPlay(2);
this.removeMovieClip();