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!"--From the publisher's web site.