The mysterious group that attacked the Ocean Turtle turns out to be a secret unit under orders from the U.S. National Security Agency. And its leader, Gabriel, has battled Kirito and Sinon before.

Sword Art Online Season 4 Episodes...

• s04e01 - In the Far North
• s04e02 - Raids
• s04e03 - The Final Load Test
• s04e04 - Dark Territory
• s04e05 - The Night Before Battle
• s04e06 - Battle of the Knights
• s04e07 - Stigma of the Disqualified
• s04e08 - Blood and Life
• s04e09 - Sword and Fist
• s04e10 - Stacia, the Goddess of Creation
• s04e11 - Heartless Choice
• s04e12 - Ray of Light
• s04e13 - The War of Underworld
• s04e14 - End to Eternity
• s04e15 - Instigation
• s04e16 - Code 871
• s04e17 - Prince of Hell
• s04e18 - Memories
• s04e19 - Awakening
• s04e20 - The Night-Sky Blade
• s04e21 - Beyond Time
• s04e22 - Alice
• s04e23 - New World

Sword Art Online Show Summary

In the near future, a Virtual Reality Massive Multiplayer Online Role-Playing Game (VRMMORPG) called Sword Art Online has been released where players control their avatars with their bodies using a piece of technology called Nerve Gear. One day, players discover they cannot log out, as the game creator is holding them captive unless they reach the 100th floor of the game's tower and defeat the final boss. However, if they die in the game, they die in real life. Their struggle for survival starts now...