Space Gun (US)

As a member of a special Search And Rescue unit. you (and an optional friend) are told to investigate an S.O.S. distress signal that was sent from a space station. what you don't know is that a group of vicious aliens have taken the colonists hostage. luckily for you, you're armed with a plasma pulse gun and four sets of grenades that are quite special (aside from the common grenade that explodes, some will freeze, incinerate, and even slice and dice the aliens).