With the growing presence of super beings around the world, the United Nations resolves to create a new group called Justice League International. Batman, Booster Gold, Green Lantern Guy Gardner, August General in Iron, Fire, Ice, Vixen and Rocket Red are charged with promoting unity and trust — but can they reach that goal without killing each other first?
The United Nations’ new international team of heroes must learn to work together — and fast — if they’re going to discover the mystery behind the giant alien Signalmen who are appearing all over the globe. Can Booster Gold lead his team to victory, or will they fall?
With the appearance of four giant, alien Signalmen, the JLI must split up to investigate the mysterious cavern beneath each one. Will the individual teams be able to handle what hides in the dark? Or will it be too late by the time the next phase comes into play…