Emperor Percival Tachyon (simply known as Percival Tachyon) is the main antagonist of Ratchet & Clank: Tools of Destruction and possibly one of the main antagonists in the series. He is a Cragmite and his species tried to control the universe but was defeated by the Lombaxes. Then he was still an egg and the Lombaxes raised him out of pity and when he learned of his true origins, he vowed to destroy the Lombaxes and drove them to another dimension and killed them. While Dr. Nefarious is considered to be the main antagonist of the series, Tachyon is sometimes considered the personal nemesis of Ratchet due to their history.