Plot summary
Superboy and Miss Martian arrive in time to prove the Justice League's innocence before the council of Rimbor. Following Black Beetle's defeat, twenty Reach devices damage the planet's magnetic field, causing various natural disasters. The superheroes destroy them with the help of Luthor, but the surprise of a twenty-first machine in the Arctic leads to the sacrifice of Kid Flash. Bart Allen/Impulse takes on Wally's role as Kid Flash and Artemis becomes Tigress full time. Meanwhile, Vandal Savage takes Warworld to Apokolips and meets with Darkseid.
Credits
Adapted from Wikipedia contributors, List of Young Justice episodes. HTML formatting and reference markers removed.