The G.I. Joe casting news just doesn't seem to end. is reporting that Arnold Vosloo (The Mummy) has signed on to play the villainous role of Zartan in the upcoming G.I. Joe action flick.

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Zartan was the chameleon-like baddie who can imitate anyone's physical and vocal traits. He is also the leader of the biker gang the Dreadnoks and he is also a mercenary who works for Destro and Cobra.

The film will be directed by Stephen Sommers and is slated for an August 7, 2009 release.