Wolverine takes on the Marvel Universe! Wolverine has long been the X-Men's most dangerous member - but now this deadly living weapon has switched sides! Defeated by the Gorgon and brainwashed by Hydra and the Hand, Wolverine has become an agent of the ruthless ninja clan - slicing and dicing his way through S.H.I.E.L.D., the Fantastic Four and the XMen! And his former friends and teammates will pay a high price to subdue him. As Hydra picks off superhumans one by one, and the X-Men mourn a fallen friend, S.H.I.E.L.D. works feverishly to deprogram Wolverine. Can he be turned against his former masters in time to prevent worldwide death and destruction? Collecting WOLVERINE (2003) #20-32. Parental Advisory