x-men legends: shadow king

So there is this villain, shadow king that I've fought twice before in the game. So I manage to beat him this time. Then I go back to the mansion, and think I'm safe.

Well, I go into the mansions brig and look up enemies profiles. That's where it happens. I get a green screen of death. Maybe it's just my playstation. Oh well, should have saved. Now I'll have to go back and beat him again.