Don't recall seeing Bruce Greenwood in 'Super 8'?

You didn't, and yet the actor -- who played Captain Pike in J.J. Abrams' 'Star Trek' reboot -- did make a big contribution to the film.

In the 'Super 8' credits, he's billed as "Cooper," yet there's no one named Cooper in the movie. Now the actor is talking about the part he played in the sci-fi movie, one that was more than a little uncomfortable to perform.

Spoilers ahead.