Grimm are attacking Vale, and it's up to team RWBY and friends to defeat them.

The first doubles match of the tournament puts Mercury and Emerald against Yatsuhashi and Coco. Later Qrow and Winter spend some quality time with their families.

Mercury fights Ruby to prevent her interfering with Penny and Pyrrha's fight. The tournament match ends in disaster and Cinder hijacks the airwaves with a grim message for the world's audience.

Roman and Neo sabotage the Atlesian military ships while the Grimm and the White Fang begin their attack on Vale.

War breaks out with battles occurring on the tournament field, the city and the school. Formerly adversarial tournament teams unite to fight the Grimm together while Ruby goes after a rogue airship that has turned on the rest of the fleet. Cinder's virus makes things worse by turning the robotic Atlesian army against both the city and its defenders.

And then the Grimm Dragon appears...

On the airship, Ruby fights Roman and Neo while Ironwood joins Glynda and Qrow on the battlefield below. The students fight Atlesian Paladins while Blake confronts Adam in the school's cafeteria, leading to a showdown between Yang and Adam.

Meanwhile, in the secret vault, Ozpin, Jaune and Pyrrha attempt to transfer Amber's Aura to Pyrrha... and Cinder shows up.