20 Things You Didn't Know About Star Trek: Nemesis
20. Patrick Stewart Originally Played Both Picard & Shinzon
Though Tom Hardy of course ended up playing the part of villainous Reman leader and Picard clone Praetor Shinzon, the very first version of the script actually had Shinzon also being portrayed by Patrick Stewart as a more direct, older clone of Picard.
There sadly aren't any further details available online about how this would've changed the story, though it's fair to assume that Nemesis would've climaxed with Patrick Stewart effectively battling himself.
Ultimately the potential for goofiness would've been extremely high had they gone this route, so bringing in a young actor to portray a younger clone was probably the right call.
However, a few years ago a curious fan cleverly deep-faked Stewart into the role of Shinzon to give fans a speculative glimpse at how it could've turned out: