It's now week two for Marvel Studios shooting Captain America: Civil War and in the days since principal photography began, we've already seen most of the main cast on set and in costume thanks to unofficial photos making the rounds online. Of the costumed heroes and villains depicted in these images though, it was Frank Grillo's Brock Rumlow, returning from his violent introduction in Captain America: The Winter Soldier, who made for the most notable appearance on set.

As Grillo put it himself, The Winter Soldier was just an origin story of sorts for his character, similar to how it was for Anthony Mackie's Sam Wilson a.k.a. Falcon. In Civil War, Grillo's Rumlow suits up in heavy gear to become the Marvel Comics antagonist known as Crossbones.

The first photos of the Crossbones costume featured Grillo sporting heavy armor, with the white "X" (cross) on his chest, and a mercenary field mask. Most notably though, he also has these strange gauntlets, serving at first glance as some sort of powered punch mechanism on each arm. We figured it was there for him to go hand-to-hand against the super-strong Captain America (Chris Evans) and as we learned from new set photos yesterday, that's exactly the case.

BREAKING: #CaptainAmerica vs #Crossbones On the set of #CivilWar RT pic.twitter.com/m76s2GCPLV— Cap: Civil War (@Cap_CivilWar) May 19, 2015

With Rumlow escaping the ruins of S.H.I.E.L.D.'s Triskelion headquarters as a helicarrier crashed through it in the final act of Captain America: The Winter Soldier, the last shot of him showed his burned body being wheeled through a hospital. Now he's back, more armed and angry than ever. Here's a closer look at what his face looks like after the incident:

@FrankGrillo as Crossbones pic.twitter.com/b201Ql4wJ4— Оля Сиганова (@OlyaSiganova) May 18, 2015

Yes, he's still handsome Frank Grillo. But don't expect that to be the full extent of his facial scarring. He only has the makeup and prosthetic work around his eyes so it's visible through the mask, so he may still have a bit of a Red Skull look to him in scenes where he's not wearing it.

In the comics, Rumlow/Crossbones actualy serves Red Skull and - just like in the Marvel Cinematic Universe - is a Neo-Nazi of sorts since he serves the modern incarnation of Hydra. Who he works for and what missions he is on during Captain America: Civil War is not yet clear, but the character does no doubt hold personal feelings against Cap, Falcon, and their team (the new Avengers), and he's likely working for whatever remains of Hydra.

And what remains of Hydra, according to Age of Ultron and Agents of S.H.I.E.L.D., isn't very much at all. However, Daniel Bruhl, the other villain in Captain America: Civil War, confirmed that he's playing Baron Zemo so we could see another situation where there's a major player behind the scenes with a badass field operative fighting Cap (Think Sebastian Stan's Winter Soldier working for Robert Redford's Alexander Pierce in the last Cap movie).

Next: How Does Black Panther Fit Into ‘Captain America: Civil War’?

“Captain America: Civil War” is directed by Anthony and Joe Russo (Marvel’s “Captain America: The Winter Soldier,” “Community”) from a screenplay by Christopher Markus & Stephen McFeely (“CaptainAmerica: The Winter Solider,” Marvel’s “Captain America: The First Avenger”). The film returns Chris Evans (“Captain America: The Winter Soldier,” Marvel’s “Avengers: Age of Ultron”) as the iconic Super Hero character Steve Rogers/Captain America along with Robert Downey Jr. (“Avengers: Age of Ultron,” Marvel’s “Iron Man 3”) as Tony Stark/Iron Man, Scarlett Johansson (“Avengers: Age of Ultron,” “CaptainAmerica: The Winter Soldier”) as Natasha Romanoff/Black Widow, Sebastian Stan (“Captain America: The Winter Soldier,” “Captain America: The First Avenger”) as Bucky Barnes/Winter Soldier, Anthony Mackie (“Avengers: Age of Ultron,” “Captain America: The Winter Soldier”) as Sam Wilson/Falcon, Paul Bettany (“Avengers: Age of Ultron,” “Iron Man 3”) as The Vision, Jeremy Renner (“Avengers: Age of Ultron,” Marvel’s “The Avengers”) as Clint Barton/Hawkeye, Don Cheadle (“Avengers: Age of Ultron,” “Iron Man 3”) as Jim Rhodes/War Machine and Elizabeth Olsen (“Avengers: Age of Ultron,” “Godzilla”) as Wanda Maximoff/Scarlet Witch.

The Avengers: Age of Ultron is now in theaters, followed by Ant-Man on July 17 2015, Captain America: Civil War on May 6 2016, Doctor Strange on November 4 2016, Guardians of the Galaxy 2 on May 5 2017, Spider-Man on July 28, 2017, Thor: Ragnarok on November 3 2017, Avengers: Infinity War – Part 1 on May 4 2018, Black Panther on July 6 2018, Captain Marvel on November 2 2018, Avengers: Infinity War – Part 2 on May 3 2019 and Inhumans on July 12, 2019.

Sources: Just Jared, Frank Grillo