The RX-0 Unicorn Gundam is the titular mobile suit of Mobile Suit Gundam Unicorn and its television re-cut, piloted by Banagher Links. When used for noble reasons by a pilot possessing the proper character, the RX-0 is the "key" to opening a mysterious object known only as Laplace's Box.

Produced as the final part of the E.F.S.F's reorganization plan - the "UC Project " - the Unicorn Gundam is a revolutionary design and to be the main symbol of the "U.C. project's" main goal - to destroy any traces of Zeonism in the Earth Sphere - and thus not only does it features a Gundam design, but also incorporates an anti-Newtype system. Two prototype machines were completed at Anaheim Electronics' factory in Granada. However, when the Vist Foundation took control of the project, they turned the Gundam into a symbol of possibility by making it the key to finding Laplace's Box - the embodied hope of the Universal Century. Featuring the most advanced mobile suit technology of the time, the machine's performance is unmatched.