MGM has tapped Vin Diesel to star and produce action-comedy ”The Machine” through his One Race Films.MGM made the announcement Thursday. Project’s based on an original script by Thomas Lennon and Robert Ben Garant, who are also producing. Production is scheduled to start in the fall. Diesel stars as a human-like machine created in secrecy by the Pentagon as the world’s first true ultimate weapon. Twenty years after the project was buried and decommissioned for reasons unknown, ”The Machine” is discovered by a kid who befriends him. Adam Rosenberg, Senior Vice President for the MGM Motion Picture Group, is supervising the film for the studio.