Justice League Vol. 4 #51
At the mercy of the Black Mercy! As they return from their adventure on the planet Trotha, the Justice League crashes on the homeworld of the Black Mercy! There, they fall prey to the most powerful psychological threat they've ever faced! Written by Jeff Loveness (Cartoon Network's Rick and Morty), this two-part descent into the dark corners of the superhero psyche will unearth fresh horror.