Transmatter Cube

The Transmatter Cube was a device located on the Justice League Satellite. A similar device was located at JSA Headquarters on Earth-Two. Both teams utilized the Transmatter Cubes in order to visit each other's respective realities for their annual JLA/JSA team-up. In one instance, the Earth-Two Transmatter Cube malfunctioned (due to the machinations of Per Degaton) and shunted the JSA to an alternate future version of Earth-Prime.