Ops in a psychic vision along with Big Boss's sons. Metal Gear Solid 4: Guns of the Patriots sees Old Snake sent back to Shadow Moses Island to re-acquire Metal Gear REX (left abandoned after the events of Metal Gear Solid) which has become Liquid Ocelot's new target. Liquid plans to remove REX's railgun to launch nuclear weapons since REX predates the SOP system of no ID lockout mechanism (sans the PAL interface). Arriving at the old hangar, Snake finds the damaged Metal Gear but discovers that Liquid has already removed the railgun. Later, Snake uses REX to confront Liquid piloting Metal Gear RAY. Even though RAY was developed as an anti-Metal Gear weapon and REX being handicapped (as the radome was still damaged and its railgun gone), Otacon reveals that REX has a "street fighter" program to execute kicking moves which Liquid was apparently not aware of. Snake and REX manage to fight Liquid to a stalemate; Otacon credits this to his assistance. REX is not seen destroyed and what happened to the mecha after the battle is unknown. Metal Gear REX, Metal Gear RAY, and a Gekko make cameo appearances in the Shadow Moses Island stage in Super Smash Bros. Brawl and Super Smash Bros. Ultimate. It also made its appearance as the final boss from LittleBigPlanet with the use of Metal Gear Solid Packs. In Metal Gear Solid: Peace Walker, in the Isla Del Monstruo as part of a collaboration with Capcom's Monster Hunter series, defeating both the Rathalos and the Tigrex unlocks a monster known as "Gear REX", which heavily resembles its mecha counterpart. Metal Gear RAY Metal Gear RAY is an anti-Metal Gear introduced in Metal Gear Solid 2: Sons of Liberty also designed by Yoji Shinkawa. This Metal Gear model comes in two variants: a manned prototype version developed to combat Metal Gear derivatives and an unmanned, computer-controlled version refitted to defend Arsenal Gear. Metal Gear RAY differs from previous Metal Gear models in that it is not a nuclear launch platform, but instead, a weapon of conventional warfare, originally designed by the U.S. Marines to hunt down and destroy the many Metal Gear derivatives that became common after Metal Gear REX's plans leak following the events of Shadow Moses. RAY is designed to be even more maneuverable and flexible in deployment than other models and can operate both on land and in water.