In the coming weeks Marvel's Agents of S.H.I.E.L.D. will experience a seismic shift as alliances are severed, evil breaks free and the Marvel universe is changed forever! A series shattering maximum event is coming to ABC starting Tuesday as the final quarter of the first season comes to its rousing conclusion, which promises to tie into Captain America: The Winter Soldier. Marvel and ABC have released a new trailer, which teases these all-new episodes, offering a look at J. August Richards as Deathlok and Jaimie Alexander as Lady Sif. Plus, is that Steve Roger's trusty shield flashing inside the logo? Check it out, then be sure to catch Marvel's Agents of S.H.I.E.L.D. when it returns tonight, Tuesday March 4 with T.A.H.I.T.I., for the beginning of what is known as Marvel's Agents of S.H.I.E.L.D.: Uprising!