Hi Hi Puffy AmiYumi was an American animated series for Cartoon Network that premiered in 2004 and starred cartoon versions of Japanese pop duo Ami Onuki and Yumi Yoshimura, known as Puffy AmiYumi. The show mixed rock music, travel and slapstick comedy, and its loud theme became closely tied to the channel's mid-2000s lineup. Years later, clips of the opening and the characters screaming have circulated in nostalgia compilations and cartoon opening collections, especially among viewers who remember watching the series as children.