Starting Oct. 6, a 25-year-old man will belong to the Internet and we have Seth Green to thank for that. The actor (along with his Robot Chicken collaborator Matthew Senreich) is launching ControlTV, an online reality series starring Tristan Couvares, a former IT recruiter. For six weeks, nearly every moment of his existence will be streamed live (at controltv.com). But unlike many other voyeuristic ventures, viewers will make decisions on behalf of Couvares, voting on everything from what he wears to whom he dates think Jim Carrey in The Truman Show fused with Choose Your Own Adventure. ''It's a really pure sociological experiment,'' explains Green. (Well, not entirely pure Couvares' car and phone, from sponsors Ford and Sprint, have already been selected.) While Couvares' life could take a turn for the better or worse depending on the whims of the Web, Green is optimistic. ''Our goal is to take a guy we believe in and try to help him along,'' he says. ''We don't want to ruin him, and we're hoping that's not what the audience is aiming for.'' So is the subject concerned about relinquishing any semblance of privacy while doing the Internet's bidding? Nah. ''It's going to be a lot of fun,'' says Couvares, ''and afterward I'll probably just return to my normal life.'' That is, if we let him.