Help remembering a Title

There was a game, back in the day that I played a couple times on the PS1 with some friends, and I cannot for the life of me remember the name of the game. So hopefully somebody can help me and give me a link to it or something.

The premise of the game is that you are some sort of alien bioweapon or something and you actually change depending on who you are possessing. You can possess different characters throughout the game and the situations change based upon who you are possessing as well as the type of weapon you are and the abilities of the weapon. This game supposedly had a ton of different endings based on who you were possessing at the end of the game as well.

Anybody?

Sounds similar to Oddworld...?
http://en.wikipedia.org/wiki/Oddworld_Adventures

Nope, I know those games. This was an RPG with human type characters

Was it Parasite Eve? http://en.wikipedia.org/wiki/Parasite_Eve_(video_game)

Hmmm...this is a trick question. I wish I could help you because I know how it feels to not remember an awesome (or sucky game). Why not in the morning or at early noon, ask this question on Yahoo! Answers? The community is huge.

Ooh it might be Parasite Eve 2

I remember the game but not the name, I think. Was mind lightening a weapon? Was it Pyschonauts or Second Sight? Destory All Humans?

goof is on the right track i think, I don't remember destory all humans though

You're an alien invading earth and blow stuff up.

It has been Yahoo asked now

http://answers.yahoo.com/question/index?qid=20091120094700AAbM3CR

No i know the game destroy all humans, i thought you were talking about a name of an attack.

My next guess is a game called ObsCure?