Taking place after the events of Winter Soldier and Age of Ultron left a lot of shit broke, Captain America: Civil War sees the government looking to restrict the authority of superheroes, and to seek out and destroy the now-rehabilitated Bucky for his crimes. Tony Stark is basically, like, "Yeah, that makes sense. I did create a pretty rotten Robo-Spader." Captain America, however, has a fairly pithy counterargument: "That's not the way I see it." As such, a line is drawn in the sand, and Avenger is pitted against Avenger in a large-scale inter-office field day gone awry.
Here's the first trailer. Prepare for intense, personal action; a first look at Black Panther; and, unfortunately, scarcely a bug-based hero to be found.