Justin Chatwin as Goku
- A powerful warrior who protects the Earth from an endless stream of rogues bent on dominating the universe and controlling the mystical objects from which the film takes its name.

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James Marsters as Piccolo
The villain of the film - Marsters explained that this incarnation of the character is “thousands of years old and a very long time ago he used to be a force of good, but [he] got into a bad argument and was put into prison for 2000 years.

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Jamie Chung as Chi-Chi
- Goku’s love interest

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Emmy Rossum as Bulma
- She aids Goku after her father’s Dragonball is stolen by Piccolo.

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Chow Yun-Fat as Master Roshi
- Goku’s mentor.

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Joon Park as Yamcha

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Eriko Tamura as Mai
- She is a chief enforcer of Piccolo’s and a shapeshifter.

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Ernie Hudson as Master Mutaito
- Master Roshi’s former sensei and the one who sealed Lord Piccolo away for centuries.

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Texas Battle as Carey Fuller
- A high school bully. He is an original character created for the film.

Luis Arrieta as Weaver
- A classmate and friend of Goku. He is an original character created for the film.

Randall Duk Kim as Grandpa Gohan
- The adoptive father and grandfather of Goku who teaches Goku everything he knows about martial arts.

Shavon Kirksey as Emi
- Another original character created just for the film.

20th Century Fox announced Dragon Ball Z would be released on April 10, 2009.