Hints and tip for Destroy All Humans!

There is a glitch in my game and at the level where you find Crypto-132 (I think that is the number) he somehow comes back to life and the entire game has changed (but not what you have to do in levels) and now you have help wherever you go. He is invincible and he doubles the phsycic power whenever you use your phsycic... He does a lot of things that help you, so can anyone tell me what I did that might have made this glitch

P.S. The game is a lot easier with Crypto-132 helping me and I'm not even using cheats which I always do for every game that I play.

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