Gyllenhaal and Downey Jr. Thrill in 'Zodiac'

It’s the dark thriller that brought real-life chills to superstars Jake Gyllenhaal and Robert Downey Jr.

Now “Extra” is giving you a sneak peek of “Zodiac,” as we sit down with the hunky superstars.

Plus, find out what Robert is saying about his young co-star… is he tough enough to make a mark in Hollywood?