He worked on a 2006 one-shot called "Cross Epoch", in cooperation with "One Piece" creator Eiichiro Oda. The story is a short crossover that presents characters from both "Dragon Ball" and "One Piece". Toriyama was the character designer and artist for the 2006 Mistwalker Xbox 360 exclusive RPG "Blue Dragon", working with Hironobu Sakaguchi and Nobuo Uematsu, both of whom he had previously worked with on "Chrono Trigger". He announced that his help with the making of the "Blue Dragon" anime might very well be his final work in anime. In his own words, he said: