The Justice League of America faces an existential threat from a mysterious, reality-warping entity known as the Hyper-clan. The team must unite their disparate powers and confront a foe that challenges not only their physical might but also their very understanding of existence, all while grappling with internal doubts and the potential collapse of their universe.

Grant Morrison's run on JLA is often lauded for its ambitious scope and imaginative storytelling, pushing the boundaries of the superhero genre. Readers and critics frequently praise the intricate plotting and the way Morrison reinvents familiar characters with a fresh, often philosophical, perspective. The narrative is noted for its complex, reality-bending concepts and its ability to blend high-stakes action with profound thematic explorations. While some find the dense mythology challenging, the overall reception highlights its status as a significant and thought-provoking contribution to the Justice League's history.