“Underdog,” the live-action film, based on the long-running Saturday morning cartoon series which first went on the air in 1964, opens nationwide on Friday, August 3rd.  City streets, Providence City Hall and the State House are among the many locations used for the film, which stars James Belushi. Interiors were filmed on sets built at the Cranston Street Armory, including a mockup of the State House dome. The State House rotunda was also used for a key scene in the movie.