Picnics and barbecues won’t be the only places to enjoy fireworks this Independence Day. TNT has some truly dramatic fireworks in store with a five-hour July 4 marathon of DALLAS, basic cable’s #1 new series for the year-to-date. The lineup will feature the first four episodes of the series, climaxing at 9 p.m. (ET/PT) with the premiere of an all-new episode.