The Donkey Kong series is a major Nintendo series. It sometimes is considered it's own series, while other times it is consider as just an expansion of the Mario series. And it's Nintendo's 4th best selling series. The series stars Donkey Kong (really an adult DK Jr. from the arcade games) fighting King K. Rool and the Kremlings with help from his many friends, including Cranky Kong (really an old DK from the arcade games), Lanky Kong, and his best friend Diddy Kong. The series has a recurring theme to replace Cs with Ks, (for example instead of Kremling Crew, Kremling Krew), as both Kongs and Kremlings have Ks at the beginning of their names.