‘Agents of S.H.I.E.L.D.’ comes to disc

When ABC announced a television series companion to its Marvel movies, an immediate question was where its events would fit into the larger Marvel narrative. And it turned out to be a major part of the storytelling. Arriving on DVD and Blu-ray on Tuesday, “Marvel’s Agents of S.H.I.E.L.D.: The Complete First Season” began after the events…