We knew Will Smith was preparing to fight a younger version of himself in the upcoming Ang Lee sci-fi film Gemini Man. Now, thanks to the trailer released today, we get a glimpse of what that will look like. The two-minute clip shows present-day Smith as Henry Brogan, an elite but aging assassin who's being chased by a younger clone. Visual effects -- similar to those that allowed Samuel L. Jackson to digitally de-age in Captain Marvel -- will make it possible for Smith to play both roles.