During the day, Bruce Wayne is the owner of Wayne Enterprises, a very big and prestigious company in Gotham City. But in the night, he is Batman the cloaked vigilante of Gotham City. Bruce Wayne is played by Christian Bale.
Rachel Dawes is a childhood friend of Bruce Wayne and is also Harvey Dent's girlfriend. When Rachel dies, it destroys them both. This affects Harvey the most. Harvey ends up teaming up with the Joker and becomes Two Face. Rachel Dawes is played by Maggie Gyllenhaal.
Commissioner Gordon is the main cop in Gotham City. He fakes his death in an attempt to catch the Joker. Thinking that Gordon is dead, the Joker goes wild on the town which eventually brings him to his end when he finds out that Gordon is still alive. Gordon is played by Gary Oldman.