Shinzon

Shinzon is a clone of Jean-Luc Picard made by the Romulans for the purpose of infiltrating the Federation. The plan was scrapped and Shinzon was sent into slave labor in the dilithium mines on Remus. His only appearance is in Star Trek: Nemesis

Shinzon managed to construct several weapons and a following of Remans to take over the Romulan senate. These weapons include a large, cloakable, heavily armed and heavily shielded starship called the Scimitar and "thalaron radiation" which can kill large numbers of people even in small amounts. He plans to use these to exterminate humanity for reasons that are never fully explained.

It is revealed that Picard had a life-threatening genetic disorder. Being a genetic copy, Shinzon has the same disorder and needs to kill Picard to cure himself. As he is on death's door, he keeps Picard and the Enterprise-E waiting in orbit around Romulus for 17 hours, invites Picard and company to dinner the next day at which point he wastes more time telling everyone his sad life story, and then mind-rapes Deanna Troi all before kidnapping Picard (one wonders if this is where DarkStar got his inspiration for his Sullust-to-Endor time figures)

Shinzon's combat tactics show as much intelligence as his prioritization of capturing Picard. He has a "perfect" cloak on his ship, yet approaches so close to his opponents so they can still hit him in spite of them firing blind. Once the Enterprise-E is crippled, Shinzon decloaks and sits right in front of them. A group of Reman troops is beamed aboard the Enterprise-E, not into any critical portions of the ship but instead, a random corridor. Picard orders a ramming course and Shinzon's response is to order "hard to port" thus making sure the Scimitar does not use its main engines to try to avoid the collision. The attempt fails and the Enterprise collides with the Scimitar, heavily damaging both ships.

Picard engages Shinzon in hand-to-hand combat onboard the Scimitar in what is supposed to be the big climactic fight. In the crowning stupidity, Picard holds a long pole straight out in front of him; much too large a pole to be moved with any significant speed in a fight and Shinzon simply runs straight onto it.

In short, Shinzon is one of the biggest morons ever seen in the Romulan Star Empire.