Spoilers /Rumours
WARNING SPOILERS
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Big Huge Spoilers for Star Trek:X
Ritterson Keys- Episode Guides
Commander Shinzon, the main villain in the film, is human - but not just any human. He is a clone of Jean-Luc Picard, created 25 years ago by a Romulan general to replace Picard. Out of fear for the Federation, the Romulan Senate decided against the plan, and gave orders to kill Shinzon. But because of who Shinzon was and what he could become, the general saved his life and sent him at the age of three to Romulus' sister planet Remus, where he was forced to work in a dilithium mining camp.
Shinzon's appearance is described as "a dynamic young man in his twenties... very handsome with pale, almost white skin and shining, golden hair." The resemblance to Picard as a youth, seen when Picard browses an old family photo album, is striking. Both Shinzon and Picard refer to mirrors, but while Shinzon looks at himself as what he is and what he's become (the past), Picard looks at himself as what he can be (the future).
The cloning process wasn't perfect, though. Shinzon was designed with "temporal RNA sequencing" so that he could age fast enough to reach Picard's age. However, the sequencing was never activated, and as a result Shinzon is dying. The only thing that can save him is a "myelodysplastic infusion" from the only person in the universe with the same DNA - Picard. But Picard would never do this voluntarily, as it would kill him.
Shinzon's physical condition hasn't stopped him from trying to realize his dreams - to reunify Romulus and Reman, to go to war with the Federation and to reclaim the Neutral Zone. He and his Reman troops burst onto the floor of the Romulan Senate, and his troops assassinate a female member of the Romulan Senate named Tal'aura. Using a previously unseen Reman Warbird, the Scimitar, he intends to go to Earth and use the ship's super weapon to strike the Federation at its very core. ("Kill that heart and the Federation will die.")
It also has a bit about the Android B- 9 which I posted under the thread
Data's Brother (another brother?)
And there is another bit about the death of a major character.