"Marvel's Agent of S.H.I.E.L.D.'s" 13th second season episode, "One of Us," officially introduces Agent May's (Ming-Na Wen) ex-husband in an official snyopsis and some brand new stills from ABC and Spoiler TV.

May's ex-husband, played by Blair Underwood, is described as "charismatic." The episode, which airs on March 17, also finds Skye's father Cal (Kyle Maclachlan) amassing a team in order to exact his revenge on Coulson (Clark Gregg).

Check out the full episode synopsis and some new stills below.

"One of Us" - Cal seeks revenge on Coulson by assembling a team of Super Villains to destroy S.H.I.E.L.D. Meanwhile, May calls on renowned Dr. Andrew Garner (Blair Underwood), her charismatic ex-husband, with a crisis that threatens to tear the team apart, on "Marvel's Agents of S.H.I.E.L.D.," Tuesday, March 17 (9:00-10:00 p.m., ET) on the ABC Television Network.

"Marvel's Agents of S.H.I.E.L.D." stars Clark Gregg as Director Phil Coulson, Ming-Na Wen as Agent Melinda May, Brett Dalton as Grant Ward, Chloe Bennet as Agent Skye, Iain De Caestecker as Agent Leo Fitz, Elizabeth Henstridge as Agent Jemma Simmons, Nick Blood as Lance Hunter and Adrianne Palicki as Bobbi Morse.

Guest starring are Henry Simmons as Alphonso "Mack" Mackenzie, Kyle Maclachlan as The Doctor/Cal, Jamie Harris as Gordon, Blair Underwood as Dr. Andrew Garner, Drea De Matteo as Karla Faye Gideon, Ric Sarabia as Wendell Levi, Geo Corvera as Francis Noche, Jeff Daniel Phillips as David A. Angar, Gregg Martin as student, Jack Kennedy as security guard and Jamal Duff as John Bruno.

"Agents of S.H.I.E.L.D." airs Tuesdays at 9 p.m. on ABC.