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ZX-22, the Breast Primeval, is one of the 31 Machine Primevals. Along with the others, it participated in the attempted mass invasion of Earth, but was reverted by the Mic Squadron into a Z Crystal, and forced to escape to Earth's surface and regenerate. Together with ZX-16 through ZX-30, it participated in the Primevals' last stand against GGG at Jupiter, fusing with one of Jupiter's moons. Breast attempted to crush GenRyuJin and GouRyuJin between itself and Torso before being defeated by Maximum Tou Long. It later became part of Z-Master and was then destroyed by GGG and King J-Der.