Take Zorboz Into Battle!

Click on the Engineering part of the ship, and you should see a robot that looks a lot like Zorbak, but this is actually Zorboz, Zorbak's machine slave. When he asks if you want to play a game, say yes. This will start a battle against an Undead Sawbot. Beat the Sawbot and you'll be able to have Zorboz join you in battle. Of course, Zorboz deals Darkness damage, just like his master. When you level up, Zorboz's Challenge will get harder and he'll get better when he's on your side. Note: I recommend having a good energy or water weapon for this, since that's what Undead Sawbot is weak against.