The Countdown tie-in trilogy continues with the Kryptonite Man on the loose, Mr. Action on the prowl and Superman on the ropes! Plus, a certain long-lost superdog returns…but what does fate hold for Jimmy Olsen?

And in ACTION COMICS #854, it’s a desperate battle for Superman, a turning point for Jimmy Olsen, and a deadly radioactive threat for Metropolis! Will Mr. Action live or die? And what will the future hold for Krypto? Plus: giant monkey!

And don’t miss ACTION COMICS #855, with art by Eric Powell!