After the Fist, Hair, and Jaw Primevals were defeated by King J-der, all 28 remaining Primevals arrived at the Earth via E.S. window. Their bodies were destroyed by a solitary wave created by the Mic Force and their cores were scattered across the earth. Muscles's core remained dormant until Pagliaccio and Arm transported the remaining cores to Jupiter. Muscles merged with one of Jupiter's moons to ambush the J-Ark, and later 3G. Muscles was defeated by Susanoh's Reflector Beam.