Adventures of Superman #560

Why are Lois, Superman, Batman, Lana Lang, Lex Luthor and the rest behaving like their Silver Age selves? Why does Batman think Lois is the woman of his dreams, and remember his teenage adventures as the sidekick of…Superboy? Why (and how, for that matter) have Jor-El and Lara come to Earth? There's only one place to find out.