ABC and Marvel have debuted the first clip from episode 20 of "Marvel's Agents of S.H.I.E.L.D." which you can check out in the player below. Titled "Nothing Personal," the episode is described as follows:
"Just when there's no one left to trust, Agent Maria Hill (Cobie Smulders) — from "Marvel's The Avengers" and "Marvel's Captain America: The Winter Solider" — returns to team up with Coulson as S.H.I.E.L.D. is being destroyed around them"
Written by Paul Zbyszewski & DJ Doyle and directed by Billy Gierhart. "Nothing Personal" is set to air on April 29. "Marvel's Agents of S.H.I.E.L.D." airs Tuesdays at 8 p.m. on ABC.