As revealed in trailers and TV spots for "Captain America: Civil War," Spider-Man makes his big debut in the Marvel Cinematic Universe by fighting on Tony Stark's side in the film's superhero showdown. The teen from Queens adds some power to Iron Man's team, but some Marvel fans might be wondering why Stark chose to recruit a kid to his cause over a more seasoned hero like Daredevil. Screenwriters Christopher Markus and Stephen McFeely explained their reasoning in an interview with IGN.

"I think he has been keeping tabs on the world, and he knows about this one kid," said Markus. "I think in some ways there's a motivation having been accused of killing a young kid earlier in the movie to, 'Maybe I can rebuild karmically some of what I've lost by helping this kid along.' And [Spider-Man's] there and he's available and [Tony's] desperate."

"He probably sees some of himself in this kid," added McFeely. "You meet this kid and he's clearly a budding scientist but doesn't have the resources Tony Stark does."

The interview also addresses something that's just slightly spoilery, so avert your eyes if you want to remain totally in the dark. In addition to Spider-Man appearing in the film, the subtitle of his upcoming solo film ("Homecoming") is one of the Winter Soldier's trigger words. While it may seem like a call ahead to the upcoming Spider-Man film, McFeely called the word's inclusion "fairly accidental."

"Captain America: Civil War" is in theaters now.