Watch this sneak peek of the season 4 premiere, "The Ghost," where Agent May informs Coulson and Mack that Daisy (a.k.a. Quake) was identified as the attacker in a vicious assault in Los Angeles. They realize they must find her quickly and uncover the truth before the military, who has orders to kill. Marvel's Agents of S.H.I.E.L.D. returns with a vengeance for the fourth exciting season in an all-new time period, TUESDAY, SEPTEMBER 20 at 10|9c.