The third trailer for the animated show RWBY from Rooster Teeth.

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

The episode gives a glimpse into the past about Cinder's motivations, how she recruits Emerald and Mercury, how she connected with the White Fang, and how she managed to steal the Fall Maiden's power. We also cut back to the present to see the immediate aftermath of what happened after Yang's victory against Mercury in the tournament.

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.

Professor Lionheart's method of passing information to Salem is revealed and Weiss' transport runs afoul of the Grimm. Meanwhile, Adam and Hazel meet with Sienna Khan, who is extremely angry with Adam's attack on Beacon Academy.

Blake and Sun try to recruit help for defending Haven, with poor results. While Ruby gives the worried Oscar a pep-talk, the Albain brothers discuss and plan the White Fang's direction.

Ruby and company meet with Lionheart, who is less than thrilled to see that not only is everyone armed but there are more people than he thought.

The fight for Haven continues, but now it's time for our heroes to turn the tides, especially now that a long lost ally has returned with an army at her back.

As the battle for Haven reaches its conclusion on the surface, Yang confronts her mother at the relic vault.

Willing to strike down anyone who gets in the way of his twisted version of justice, Adam has declared to fight for the rights of his people, but over the years he's strayed further and further from these idealistic claims. He's a dangerous combination of ferocity and delusion whose only goal is to torment his ex-partner, Blake Belladonna, whom he considers to be responsible for his fall from power.

Ruby Rose and her friends have been burdened with transporting the Relic of Knowledge safely to Atlas. There's countless miles of Grimm-covered countryside between the city of Mistral and the northern coastline of Anima. Fortunately, the Argus Limited can easily make the journey... so long as nothing goes wrong.

Our heroes have one shot to pull off the heist of their lives, and if they're going to succeed, they'll need everyone to do their part. It's go time.

The only thing standing between our heroes and Atlas is Caroline Cordovin, but it will have to be a joint effort if they're going to bring her down. Meanwhile, Yang races to find Blake while Adam does his best to finish her.

Our heroes are running out of time. As Cordovin continues to stand tall, Blake and Yang stand together, and all combatants must ask themselves, "How far am I willing to go to win?"