Last week, thanks to the folks over at Spoiler TV, we revealed the synopsis for the fourteenth episode of Agents of S.H.I.E.L.D.‘s third season, titled “Watchdogs”, and in doing so, we revealed that actor Titus Welliver would finally be returning as Agent Blake. Now, ABC has not only released the full synopsis for the upcoming episode, but also a small batch of stills featuring members of the S.H.I.E.L.D. team on a mission, and what appears to be a group called The Watchdogs. You can view the stills in the attached gallery. And to go with the above stills, here is the full synopsis that teases the introduction of the new group, as well as what appears to be the possible introduction of Mack’s brother if Ruben Mackenzie is in fact meant to be a relative of Alphonso “Mack” Mackenzie. Check out the full synopsis below!

Marvel’s Agents of S.H.I.E.L.D: Watchdogs (3/2) A TERRORIST ACT

REVEALS A NEW ADVERSARY, ON “MARVEL’S AGENTS OF S.H.I.E.L.D.” ON ABC

“Watchdogs” – When a radical group called The Watchdogs emerges with plans to eliminate the Inhumans, Agent Mack and his brother become caught in the crossfire. Meanwhile, Simmons discovers a powerful chemical compound that could alter the future for Inhumans, on “Marvel’s Agents of S.H.I.E.L.D.,” TUESDAY, MARCH 29 (9:00-10:00 p.m. EDT) 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 Daisy Johnson, Iain De Caestecker as Agent Leo Fitz, Elizabeth Henstridge as Agent Jemma Simmons, Nick Blood as Agent Lance Hunter, Adrianne Palicki as Agent Bobbi Morse, Henry Simmons as Agent Alphonso “Mack” MacKenzie and Luke Mitchell as Lincoln Campbell.

Guest starring are Titus Welliver as Felix Blake, Mark Dacascos as Giyera, Gaius Charles as Ruben Mackenzie, Trenton Rostedt as Dallas Wyatt, Justin Morck as Watchdog Alpha, Jonathan Camp as Watchdog Oscar and D. Elliot Woods as Watchdog Victor.

”Watchdogs” was written by Drew Z. Greenberg and directed by Jesse Bochco.

Agents of S.H.I.E.L.D. airs Tuesdays on ABC at 9 PM EST. Be sure to tune in! And as always, for all things S.H.I.E.L.D. be sure to follow along here.