Warning: This post will contain spoilers for Captain America: Civil War. 

One of the best parts of Captain America: Civil War is its surprisingly unassuming villain, Baron Zemo. Sure, that name sounds familiar to comic book readers, but the mask-wearing version in the comics is not the one we see in Civil War. Instead, he's basically a guy who wants revenge. The events in Sokovia at the end of Age of Ultron greatly impacted his family and killed his father, and now this dude just wants to get back at the Avengers in the worst way possible: by turning them against one another.

And it works!

It works so well that when all is said and done and the credits begin to roll, you're left with a strange feeling, right? A feeling like... wait, the good guys didn't win this one. Their relationships are now forever fractured. The revelations unwrapped in Civil War's final moments will greatly impact the future of this so-called "family," and it's all thanks to an unassuming guy without superpowers who basically outsmarted them all. Sound familiar?

"Our model was [in the movie] Seven," Civil War cowriter Stephen McFeely revealed during a chat with Fandango. "Kevin Spacey wins tragically in that movie, and that’s how Zemo came about."

You'll remember how at the end of Seven, Spacey's John Doe is finally captured, but he in turn left one last grisly surprise for our heroic pair of detectives, played by Brad Pitt and Morgan Freeman. That "surprise" will go down as one of the great twist endings of all time.

"We wanted to fake you out," McFeely adds. "We always knew Tony Stark was going to be the antagonist and Steve Rogers was going to be the protagonist, and we knew we wanted them to fight at the end. They weren’t going to shake hands and go fight someone else. So if you had a villain with a big world-ending plan, they would’ve put their differences aside. We wanted a villain who was smart who would kind of win in the end."

Both Civil War writers, McFeely and Christopher Markus, admit they could've gone a more generic route with the villain. 

"We wanted someone who had been hurt by their actions and who had resentment toward them," Markus says. "He became Zemo because Zemo had lost his father in the comics, which is what motivates younger Zemo. This character had lost his father, so he began to feel like a version of Zemo. Who’s a villain who would be capable of destroying the Avengers? We could’ve called him John Smith – I guess that’s possible – but if you get the Avengers, you should get top-drawer villains."

What we end up getting with Zemo is a villain who isn't fighting our heroes in some climactic battle. Instead, he goes outside to try to off himself while our heroes fight each other inside. 

And what a fight it is! Iron Man is trying to get at Winter Soldier, while Captain America is trying to protect his buddy, Bucky. It's one of the most intense brawls we've ever seen in a Marvel movie, and Markus and McFeely told us their intention with that fight was to create a scene that just plain hurts. 

"We just wanted to hurt them," McFeely says. "We wanted it to be pretty serious. Just thinking about it – I mean Captain America fighting Iron Man? That’s gotta hurt. Just punching all that metal, and the metal hitting his face. It’s very violent. We wanted it to hurt the audience as much as it hurts them."

So did it hurt you? 

Captain America: Civil War is now in theaters.