Episode 300

"Zoro the Fierce God! The Incarnation of Asura Revealed by His Soul" is the 300th episode of the One Piece anime, and takes place during the Enies Lobby arc.

Short Summary
Zoro finally defeats Kaku with his new power, Asura, meanwhile Luffy activates Gear Second in his fight against Lucci, who in turn transforms into his half-leopard form.