UPN has reportedly commissioned advertisements touting William Shatner's (James T. Kirk) return to Star Trek. CBS Television City Research Center, located in Las Vegas's MGM grand hotel, is showing a commercial for Enterprise's fourth season announcing a guest appearance by Shatner, according to a post by 'Lt. Barclay' on the TrekWeb message boards. Barclay said in his report that the center previewed an episode of CBS's new comedy series, Centre of the Universe, for visitors. "During the show, a few UPN commercials were shown, including one for Enterprise," he said in his report. The Enterprise ad reportedly contained scenes from...