@strawCake - Saturn's were indeed made out of plastic when they first came out. I don't think they were as sturdy as they could have been though. A friend of mine used to have one and he got into a small accident that really messed the car up!
And actually, Chevy Corvette's feature a fiber glass reinforced plastic body too! I would never have guessed that one but I read about it in an article a little while ago.