Operation: Triple Threat was a two pronged attack attempted by Dr. Eggman following Sonic the Hedgehog's return from space. Designed to hit his enemies in the Kingdom of Acorn and United Federation, it involved launching nuclear missiles from the city of Old Megaopolis while dispatching an army of SWATbots to destroy the energy barrier around Robotropolis, releasing nuclear fallout across Mobius. Fortunately, the efforts of the Knothole Freedom Fighters, Chaotix, Mes Braves Battalion, GUN, and Shadow the Hedgehog thwarted both attacks. (StH: #131, #132, #133)