Agent Stone is the secondary antagonist of the Sonic the Hedgehog film series produced by Paramount Pictures and its spin-offs. He is a human and Dr. Robotnik's assistant. When Sonic the Hedgehog revealed himself on Earth, Stone assisted Robotnik on his quest to capture the alien hedgehog. After Robotnik got banished from Earth, Stone began following Robotnik's manifesto in order to elevate himself above the common man using science, eventually becoming the owner of the Mean Bean Coffee Café in Green Hills. After Robotnik returned to Earth with Knuckles the Echidna, Stone returned to work for him on his quest to find the Master Emerald and be recognized throughout the galaxy. After Robotnik got the Master Emerald, he and Stone used the Giant Eggman Robot to attack Green Hills until Sonic defeated them, though Stone managed to survive their defeat and elude capture by G.U.N.