What was the first ever movie you saw him in?

Mississippi Burning. Saw that in school for english (2nd language) class.

Streets of Fire but most people who were alive and watching movies remember him from Platoon.

To Live and Die in LA. I'm sure he would have been second billed, it was a very big part as the main villain.

Streets of Fire but his role in "To Live and Die in L.A." was more memorable for me.

Clear and Present Danger

Best ones of Willem Dafoe

Platoon
To Live and Die in LA (I can’t remember the first time I saw Dafoe, but it was either To Live and Die in LA or Streets of Fire)
Light Sleeper (I love this movie - he was so good in this and so was Sarandon)
And The English Patient

To Live and Die in L.A. (1985)

Probably Speed 2 , although it's possible I saw him in a previous movie without knowing who he was.