Marvel Studios and ABC have released the synopsis for the eighteenth episode of Agents of S.H.I.E.L.D. Season 2, “The Frenemy of my Enemy.”

In “The Frenemy of My Enemy,” a dangerous new alliance is formed as Coulson and Hunter turn to the last person anyone would expect – Grant Ward! As the war between S.H.I.E.L.D. factions continues, Skye and Lincoln will find themselves drawn into this conflict.

Agents of S.H.I.E.L.D. stars Clark Gregg as Agent Phil Coulson, Ming-Na Wen as Agent Melinda May, Brett Dalton as Grant Ward, Chloe Bennet as 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.

“The Frenemy of my Enemy” guest stars Henry Simmons as Alphonso “Mack” Mackenzie, Henry Goodman as Dr. List, Kyle MacLachlan as Cal, Jamie Harris as Gordon, Maya Stojan as Kara, Dichen Lachman as Jiaying, Luke Mitchell as Lincoln Campbell, Kris Lemche as Ethan, Staci Roberts as Paula, and Trenton Rostedt as Hoodie Guy.

Agents of S.H.I.E.L.D., “The Frenemy of my Enemy,” airs Tuesday, April 21 at 9 p.m. ET on ABC.