When "Marvel's Agents of S.H.I.E.L.D." Season 2 returns next Tuesday, we'll find ourselves thrust back into the ongoing battle within SHIELD. "Frenemy Of My Enemy," the all-new Episode 18, will be full of action, suspense, and surprises. Watch a full "Frenemy Of My Enemy" (S02E18) promo preview video, plus catch up on more Episode 18 spoilers below!

ABC has released a new promo preview video in order to give fans a sneak-peek of what to expect next week - and the war is on for SHIELD.

Check out the full "Frenemy Of My Enemy" (S02E18) preview video below for a spoiler-filled look at what's next. Warning: spoilers ahead!

"The world faces the dawn of a new age," teases the narrarator of the promo. "Director Coulson's latest mission may hold the key to saving it," he continues.

Will Coulson be able to bring an end to the ongoing battle?

As we previously reported, in "Frenemy Of My Enemy," Episode 18 of Season 2, "Grant Ward may be Coulson's last hope," teases ABC in a new press release.

It appears that Grant Ward is in fact the "frenemy" described in the episode's title.

As the ABC synopsis explains, "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, on "Marvel's Agents of S.H.I.E.L.D.," TUESDAY, APRIL 21 (9:00-10:00 p.m., ET) on the ABC Television Network," concludes the synopsis.

Excited for an all-new episode of "Marvel's Agents of S.H.I.E.L.D." yet? Will the battle within SHIELD finally subside in "Frenemy Of My Enemy" (S02E18)? Sound off with your thoughts and theories about the spoilers and promo preview video in the comments section below.

"Frenemy Of My Enemy," Episode 18 of "Marvel's Agents of S.H.I.E.L.D." Season 2, airs Tuesday, April 21 at 9:00 p.m. EST on ABC.