The development of the Z-Cross began with the idea that a mobile suit equipped with a psycho-jack function could control Sharon's red rose. However, the first unit disappeared (escaped?) during testing, and the plan was changed to a mobile suit using the second unit, GFreD, as the control core.

Eight funnels utilizing the phase reversal phenomenon of Minovsky particles create a cube-shaped barrier that traps objects within which they contract and disintegrate infinitely. This was named Qube-Ley.

After witnessing this experiment, researchers began developing the ZX-EXA (Zacross-Exa) to prepare for any eventuality.

Sharon's Red Rose Qube-Ley Irradiator | ケンジャ's Gunpla works