Soul Eater Episode 18

The students at Shibusen are celebrating its founding, and Medusa uses this opportunity to execute her plan. Free traps all the meisters and the Shinigami inside an Independence Cube, but Sid manages to let Maka, Black Star and Kid with their weapons, as well as Stein, escape. Now, they must go into the underground of Shibusen, where Medusa's goal lies.