No, Tom Cruise wasn't nearly Halo's Master Chief, and Julia Roberts wasn't nearly in the series either - but there was this conversation at a party

Hollywood superstar Tom Cruise didn't nearly voice Halo's famous protagonist Master Chief, and Hollywood superstar Julia Roberts wasn't nearly in Halo either. There was a conversation at a party once, between a casting agent and Halo voice director and composer Marty O'Donnell, but that's as far as it got.

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source https://www.eurogamer.net/tom-cruise-julia-roberts-halo-master-chief-bungie