An explosion near the sun opens a temporary rift into the Phantom Zone allowing General Zod to escape as he plans to free Faora and Quex-Ul. When members of the Justice League are affected by a fragment of Krypton (which didn't turn into Kryptonite) and become phantom-like, their only hope for freedom is to somehow get a message to Booster Gold to get them out of the phantom-like state before they end up in the Phantom Zone as well as stopping General Zod before he frees Faora and Quex-Ul.