The Nemesis was a ship used by the Decepticons. It crashed somewhere in the North Pacific Ocean, which the Decepticons were fishing its parts, and Kiysari made a theory about it. They're still fishing out pieces, and they found Lemon in shock-stasis on a piece of the ship. In its past life, it used to insert fear into the Autobots. Actually, we don't know much about the Nemesis, like what rooms it had, and whatnot. We just assume it had a cloning room.