Khaos the Hedgehog is a American video game series and media franchise created by Green ages. The franchise follows Boom, an anthropomorphic Green Echidna who battles the evil Doctor Rainerack, a mad scientist. The main Boom the Echidna games are platformers mostly developed by Boom Team; other games, developed by various studios, include spin-offs in the racing, fighting, party and sports genres. The franchise also incorporates printed media, animations, feature films, and merchandise.