A surveillance picture released by police Wednesday afternoon shows a man armed with what appears to be a small Klingon sword, holding up a 7-Eleven convenience store.That same man robbed another 7-Eleven store store a half-hour later, and remains at large, Colorado Springs police Lt. David Whitlock said.The first robbery was reported at 1:50 a.m., at 145 N Spruce St. The clerk told police a white man in his 20s, wearing a black mask, black jacket, and blue jeans, entered the store with a weapon the clerk recognized from the Star Trek TV series.The robber demanded money and left with an undisclosed amount.A half hour later, police received a call from a 7-Eleven at 2407 N. Union Blvd., where a man matching the previous description entered the store with a similar weapon. He also demanded money from the store clerk. The clerk refused and the robber "transported" himself out of the store on foot.Both clerks described the weapon as a Star Trek Klingon-type sword, called a "bat'leth."Neither clerk was injured in the robberies.The Startrek.com Web site describes the Klingon weapon as crescent-shaped and about a yard long. However, the weapon that the man was wielding appears to be smaller than that. The bat'leth has points on both ends, two points in between and a handle on the outside.Police said they don't know if the sword used by the robber was made of metal.Klingons were warlike enemies of the good-guy United Federation of Planets in the original "Star Trek" series but were allies in "Star Trek: The Next Generation."