The Egg Carrier 2 was the second Egg Carrier that Doctor Eggman had built. It appeared only once briefly in the Sonic Adventure; he had tried to use it against Chaos in case he rebelled and refused to obey orders. Consequently, it was destroyed while attacking Perfect Chaos. The same thing happened in the Sonic X adaption.
After the events of Sonic Adventure, the Egg Carrier 2 crashed into the ocean below and started floating on the surface like the first Egg Carrier. Seto Kaiba and Mokuba Kaiba arrived to investigate the Egg Carrier 2, where the White Chaos Emerald is landed.