Taken from Wizard magazines Mega movie issue: Wizard: There's been some confusion on how this film relates to the first two films. Theres a vague continuity, right? Bryan Singer: Yes. This essentially, for lack of a better term, a sequal to the second movie without any mention of the outlaws from krypton or any of that. We know he came to Earth. He was known as Superman. He was responsible for putting Lex Luthor in prison and then he left. Lois Lane's theory is he took off in a futile effort to find his home.