Previously on Justice League:

After the inmates of Arkham Asylum escape yet again, The Joker teamed up with genius Lex Luthor to use their combined power and gadgetry to make Lex the next US President! Luckily, the Dynamic Duo were able to stop them, along with help from the Justice League. Now, after the downfall of their secret weapon, the Joker-Bot, the Deadly Duo are locked up. However, there is still one more threat among the stars.

Sinestro was unaware of how he got here. He had questions instantly. "Show yourselves!" He roared, demanding to know who brought him here. "Who summons the master of the Yellow Lanterns?!" Then, he noticed a pink portal open, with Star Sapphire emerging. "I know that you feed off the power of fear." She said, once noticing Sinestro. "But love conquers all." "Love will not stop the monster that is fear!" And with that, the two began to battle. Sinestro summoned a centipede construct, but Star captured it in a heart-shaped jar. "I love disappointing you." Suddenly, a red, blood-like portal opened, and an angry red beast emerged! "OWWWWAAAAAARRRRRRRGGGGHHHHHH!" Atrocitus roared. "YOU WILL FEEL MY UNBOUND FURY, HE WHO SUMMONED ME!" "You are always so angry, creature." Star said as she dodged a bull construct. Then, the centipede construct was freed, and Star found herself outnumbered. All she could do was hope for aid. Luckily, she knew someone who was powered by that emotion. And with that, her aid came in the form of the Blue Lantern, Saint Walker. "I fear that this time, the Green Lanterns and their willpower will not help us this time." He said. "I was afraid of that." Star replied. After a moth construct held the others back, the Orange Lantern, Larfleeze appeared, greedy for battle. "We now have you outmatched." Sinestro roared. "Tell us why you have brought us here!" "Outmatched?" A voice said. "Not anymore." Indigo-1 then held back Larfleeze's hand construct as she explained. "However, we are not the ones who summoned you." Sinestro was confused. "If you are not responsible," He asked. "Then who is?" Then, another voice replied, as a skull-like ship with tendrils emerged. "That," The voice said. "Would be me."