As the hype for Batman V Superman: Dawn of Justice grows, Warner Brothers has just released the official synopsis for BvS today. Without spoiling much of the actual plot for the movie, the synopsis sums up the movie pretty well.
Here is the synopsis that Warner Brothers released (I got this from ComingSoon.Net):
Fearing the actions of a god-like Super Hero left unchecked, Gotham City’s own formidable, forceful vigilante takes on Metropolis’s most revered, modern-day savior, while the world wrestles with what sort of hero it really needs. And with Batman and Superman at war with one another, a new threat quickly arises, putting mankind in greater danger than it’s ever known before.
On a side note, this synopsis keeps the possibility of Doomsday appearing in the movie (I have a whole fan theory about it here). However, seeing this just makes me more hyped for the movie!
Batman V Superman: Dawn of Justice will be released in theaters on March 25, 2016, and stars Henry Cavill, Ben Affleck, Gal Gadot, Jesse Eisenberg, Amy Adams, Diane Lane, Laurence Fishburne, Jason Mamoa, and Ray Fisher.
Cast list from IMDB.