Green Lantern seeks out Batman's help in locating renegade Green Lantern Sinestro, but when the villain comes to Earth, the Penguin ends up with the hero's power ring.

The super-powered members of the Justice League begin disappearing one by one. Only Batman and Green Arrow are left to investigate and discover that old enemies are involved.

The heroes fight their android counterparts to recover the Justice League's powers, while the Joining prepares for its final assault on Earth.