Crash Bandicoot: Mutiple Cortex is a direct sequel to Crash Bandicoot Rebirth. It focuses on the real Cortex, N. Tropy and Uka Uka who were stuck in time loop ever since Crash Bandicoot: Warped. There is a hole in the vortex that grows bigger and it allows Cortexs from alternate universes travel through. All these Cortexs escape from the hole and enter the real Cortex's universe. They soon decide that they will not only take over this universe, but the alternate universe too.