Marvel’s Agents of S.H.I.E.L.D. let out a major MCU bombshell Posted on 14/12/2014 by Jessica Hannan Marvel’s Agents of S.H.I.E.L.D. let out a bombshell of what’s to come on Phase Three of the Marvel Cinematic Universe (MCU).Anyone not looking for spoilers, click the red x at the top of the screen....