Former “E.R” star Ming-Na will return to the superhero realm (she had a role in the 1994 film “Street-Fighter” with Jean-Claude Van Damme) for “S.H.I.E.L.D”, Joss Whedon’s small-screen spin-off of “The Avengers”. Na, also remembered for her role in “The Joy Luck Club”, joins Clark Gregg, who is reprising his role as agent Phil Coulson [...]