"Batman v Superman: Dawn of Justice" star Henry Cavill has a word of caution: never forget to give Superman his salted caramel mochaccino. The actor -- who will reprise his role in this fall's "Justice League" -- posted a behind-the-scenes photo from his work on "Batman v Superman" on his Instagram, in which he joked that his fury is triggered by his caffeine addiction.

The photo is taken from the titular fight sequence, where Batman and Superman finally go head-to-head. In the photo, Cavill's Superman is just about ready to charge at Batman, and his face is contorted with rage due to the Dark Knight's antagonism. However, since Ben Affleck's Batman is just out of the shot, it looks as though Cavill is running straight for the camera men.

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"Remembering a time while shooting BvS and they told me I wasn't allowed my usual Salted Caramel Mochaccino with skinny coconut milk and whip," he joked in the caption, which was posted with the hashtags #NoMercy and #NoExcuses.

Remembering a time while shooting BvS and they told me I wasn't allowed my usual Salted Caramel Mochaccino with skinny coconut milk and whip... #NoMercy #NoExcuses #Superman

A photo posted by Henry Cavill (@henrycavill) on

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Though it's part of the title, Superman's battle with Batman isn't the climactic fight of the film. Once Superman's cry for his mother humanizes him in Batman's eyes, the two work together to take down Doomsday, who was created by Lex Luthor in the fallen Kryptonian ship. Wonder Woman also joins the fight as soon as Doomsday begins to destroy Metropolis.

Cavill will reprise his role as the Man of Steel in "Justice League" despite his character's death in the end of the film. Superman will join Batman and Wonder Woman, who fought by his side in "Batman v Superman," as well as newcomers Cyborg and the Flash.

Starring Ben Affleck, Henry Cavill and Gal Gadot, “Batman v Superman: Dawn of Justice” is now available for purchase on Digital HD, Blu-ray and DVD. Opening Nov. 17, 2017, “Justice League” stars Ben Affleck, Henry Cavill, Amy Adams, Gal Gadot, Jason Momoa, Ezra Miller, Raymond Fisher, Willem Dafoe, Jesse Eisenberg, Jeremy Irons, Diane Lane, Connie Nielsen and J.K. Simmons.