Coulson (Clark Gregg) confronts Mack (Henry Simmons) about tampering with his precious car Lola in a new clip from next week's Marvel's Agents of S.H.I.E.L.D., "One Door Closes", airing Tuesday, March 31 at 9 PM ET on ABC. When the new poster for the episode was revealed yesterday, executive producer Jeffrey Bell teased that fans will finally learn more about Mack and Mockingbird's (Adrianne Palicki) secret mission. At this point in the show, there are essentially two versions of S.H.I.E.L.D., and it seems we'll learn much more next week.

In "One Door Closes", war comes to Coulson's doorstep in a way he never anticipated as shocking revelations are brought to light, and Skye struggles to control her new abilities but will soon make a decision that irrevocably changes her life. Along with Henry Simmons' Mack, other guest stars for next week's episode include Lucy Lawless as Isabelle Hartley, Edward James Olmos as Robert Gonzales, Jamie Harris as Gordon, Christine Adams as Agent Weaver, Kirk Acevedo as Agent Calderon, Cornelius Smith Jr. as Case, Saila Rao as Susanna, Mackenzie Astin as Tim Maguire and Rick Otto as lead Hydra agent.

Can Mack be trusted by Coulson? Is the entire S.H.I.E.L.D. team in danger? Let us know what you think after checking out this new clip from Marvel's Agents of S.H.I.E.L.D. below, before tuning in to "One Door Closes" next week on ABC.