Shinzon: The Romulans had somehow gained possession of your DNA and I had been created. And when I was ready, they were going to replace you with me... put a Romulan agent at the heart of Starfleet. It was a bold plan. Jean-Luc Picard: What happened? Shinzon: As happens frequently here on Romulus... a new government came to power. They decided to abandon the plan. They were afraid that I might be discovered, that it would lead to war.
Shinzon tells some of his life story to Picard.