http://www.imdb.com/title/tt1098327/fullcredits#cast



Justin Chatwin ... Goku

James Marsters ... Piccolo
other cast:

Emmy Rossum

Yun-Fat Chow ... Master Roshi

Jamie Chung ... Chi-Chi

James Kyson Lee ... Yamcha (rumored)

Joon Park ... Yamcha

Eriko Tamura ... Mai