It is 21 years since American soap opera Dallas was last on air. But now JR, Bobby and Sue Ellen are back, joined by a host of new characters - the next generation of backstabbing Ewings and Barnes - including Josh Henderson as JR's son John Rossbr br Dallas ran from 1978 to 1991, with the 1981 episode when JR was shot by a mystery assailant still one of the most watched television shows ever.