Which actor or actress had the greatest film debut? Who absolutely nailed it in their very first feature film role in a way that was just unforgettable?

Well, there have been quite a number of people who did that.

I guess my personal favorite would be Kathleen Turner in the movie "Body Heat" in 1981. UnforGETable!!!

Here's Roger Ebert's review:

"Body Heat"

Now it's your turn to pick one...