When the workers and patrons of Haley's Circus sample Dr. McKee's Cure All, they begin a painful transformation into psychotic killers and it is up to Jonah Hex and Dr. Arkham find the source.
This volume collects All-Star Western issues 0, 13-16.

Even when Gotham City was just a one-horse town, crime was rampant--and things only get worse when bounty hunter Jonah Hex comes to town. Amadeus Arkham, a pioneer in criminal psychology, enlists Hex's special brand of justice to help the Gotham Police Department track down a vicious serial killer!

The fan-favorite writing team of Jimmy Palmiotti and Justin Gray (JONAH HEX, TERRA) team with popular aritst Amanda Conner (JSA CLASSIFIED, TERRA) for the rip-roaring solo adventures of Power Girl. She bursts from the pages of the JUSTICE SOCIETY OF AMERICA to star in her own series. In this volume, Power Girl, having defeated Ultra-Humanite, now must contend with Satanna and her animal menagerie, who have returned to avenge her fallen lover. If that wasn't enough, the alien Zartox has called upon Power Girl to help save his dying planet.

The fan-favorite writing team of Jimmy Palmiotti and Justin Gray (JONAH HEX, TERRA) team with popular aritst Amanda Conner (JSA CLASSIFIED, TERRA) for the rip-roaring solo adventures of Power Girl. She bursts from the pages of the JUSTICE SOCIETY OF AMERICA to star in her own series. Power Girl wants to build herself a secret identity but a major villain from her past, the Ultra-Humanite, has other plans in store for her and to get his way, he's holding Manhattan hostage. Plus, a trio of sexy alien marauders hits Earth for the ultimate party. Unfortunately, by their standards, that means destroying it!