Some performances are just so indelible that you can't imagine anyone else possibly taking on the role. Sigourney Weaver is Ellen Ripley. Al Pacino is Michael Corleone. And could anyone possibly have played the star-crossed lovers of "Titanic," Rose and Jack, other than Kate Winslet and Leonardo DiCaprio?
Well, how about Kate Winslet and... Jeremy Sisto?
Yeah, we have a feeling you're going to want to see this.
It's hard to believe now, but once upon a time, Leonardo DiCaprio wasn't the frontrunner to play the gallant and doomed Jack Dawson. Instead, it was Jeremy Sisto ("Law & Order") up for the part. More amazingly, Winslet was no shoo-in either, as director James Cameron had concerns about the then-19-year-old's ability to command the screen on such an epic project.
So in order to see just what he was dealing with, Cameron put together a screen test for Winslet and Sisto, with the two acting out a scene from the film — a scene which we have right here courtesy of Movies.com and the new "Titanic" Blu-ray set.
Luckily for everyone, Cameron liked what he saw from Winslet enough to cast her in the film. But check out this clip and just try to imagine how different "Titanic" might have been without Leo and Kate.