Composite Crisis!

Superman has been defeated by Lex Luthor or so the evil mastermind thinks! Trapped in a Kryptonite fortress under the sea, our hero is fading fast, but he can't be defeated when his friends have his back! And while he is recovering, a new Kryptonian arrives on the scene! Plus, something weird has come to Central City. The Flash might provide some answers - if you can keep up!