• From L-R: Cast members Clark Gregg, Ming-Na Wen, Brett Dalton, Chloe Bennet, Iain De Caestecker and Elizabeth Henstridge participate in a panel for "Marvel's Agents of S.H.I.E.L.D." during the Disney ABC Television Group sessions at the Television Critics

From L-R: Cast members Clark Gregg, Ming-Na Wen, Brett Dalton, Chloe Bennet, Iain De Caestecker and Elizabeth Henstridge participate in a panel for "Marvel's Agents of S.H.I.E.L.D." during the Disney ABC Television Group sessions at the Television Critics (Photo : REUTERS/Phil McCarten)

"Marvel's Agents of S.H.I.E.L.D." Season 2 continues with Episode 18 titled "The Frenemy of My Enemy" airing on April 21, 2015. The upcoming episode will see the return of Grant Ward, the traitor who caused great damage to the S.H.I.E.L.D. in Season 1. Meanwhile, Phil Coulson struggles to keep his crime-fighting organisation and agents together in the wake of war with Gonzalez. Here are few spoilers for the next episode of "Marvel's Agents of S.H.I.E.L.D." Season 2. Read on to find out what happens next.

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[Spoiler alert! This article contains spoilers for "Marvel's Agents of S.H.I.E.L.D." Season 2. Please do not read further if you don't want to know more about it.]

Episode 18 of "Marvel's Agents of S.H.I.E.L.D." will see two enemies joining hands to achieve a common goal. In the effort to reclaim S.H.I.E.L.D. from the clutches of Gonzalez and allies Bobbi and Mack, Coulson is forced to form a highly unlikely and dangerous alliance.

ABC has released synopsis for "The Frenemy of My Enemy" on its official website. According to the press release, Grant Ward, who revealed himself as secret HYDRA agent, is Coulson's ace in the hole. In order to protect S.H.I.E.L.D. and himself, Coulson approaches Grant Ward. Supporting Coulson in his secret mission is Hunter. Meanwhile, the battle between the two groups continues.

Elsewhere, Skye, who is training with her mother to master her superpowers, will find herself pulled into this war. She is not the only one to feel the impact. Lincoln will also get forcibly involved in the dispute.

A promo video (as published on YouTube by Television Promos) for "Marvel's Agents of S.H.I.E.L.D." Season 2 Episode 18 teases the events of "The Frenemy of My Enemy" along with clips from Marvel's latest movie "Avengers: Age of Ultron." Scroll down to watch the video.

Another 2 minute 5 seconds video (as published on YouTube.com by Marvel Entertainment) shows the reaction of Coulson's S.H.I.E.L.D. agents when he reveals that they are making a deal with Ward.

"Marvel's Agents of S.H.I.E.L.D." Season 2 Episode 18 "The Frenemy of My Enemy" airs April 21 at 9:00 pm on ABC. Stay tuned for more spoilers.