The best part of the original game, also done well in Star Control II, is the combat. Each round of fighting pits 2 ships against each other in a battle to the death. Each alien race has their own ship design, each varying wildly from the others. As you play, you see an image of that alien race manipulating its controls as you press each button, which I always found amusing. Each ship has two resources they must draw on: crew, and energy. Crew is the number of crew members left on board. These are basically used as hit points for the ship. The energy is what is drawn on for most of the weapons systems (with a few exceptions). Except for one or two exceptions, crew do not regenerate, so once you lose a crew member you can never regain that. Energy is depleted by a specified amount each time a weapon is fired. Different weapons require different amounts of energy, and each ship type regenerates energy at a different rate. In addition, each ship has a different mass, acceleration, and top speed (though that speed can be exceeded by using gravity slings, more on that later).