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The 45th annual Comic-Con International celebration of the popular arts opened at the San Diego Convention Center Thursday.   An area near the Hilton San Diego Bayfront Hotel has been turned into the Gotham Interactive Fan Zone. "Gotham" is a television series that will run on Fox beginning in September that is based on DC Comics' characters.

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Mayor Kevin Faulconer officially welcomed Conic Con fans Thursday morning and then he and Council President Todd Gloria rode a 200-foot-long zipline to the podium at the Gotham Fan Zone. 

Pre-paid parking at the convention center and Hilton Bayfront is sold out. Parking at the Ace Parking lot at 11th Avenue and C Street costs $60 per day.  Free shuttles are running between the convention center and hotels in downtown, Mission Valley, Shelter Island and Harbor Island. Shuttle service is running 24 hours a day until Sunday at 7 p.m.

Organizers encourage attendees to use the San Diego Trolley and the North County Transit District's Coaster train. The Metropolitan Transit Systems says the Green Line trolley to the convention center and Gaslamp Quarter are operating every seven and a half minutes -- twice as often as normal -- during Comic-Con.  The trolley system is offering paperless tickets on its new MTicket mobile application. A spokesman for the agency said the trolley carries an additional 215,000 passengers during the convention.