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Commencement
Episode number: 1
Overview: In isolation his entire life, Nagate must adjust to life in a centuries-old space colony while training as a cadet pilot to fight an ancient threat.
Oblivion
Episode number: 2
Overview: Nagate is haunted by his first combat experience against the Gauna. Later, he meets the elite pilots of Sidonia.
Glory
Episode number: 3
Overview: Exploring Sidonia, Nagate makes an enemy of Kunato while protecting a friend. The Gauna attack, calling the pilots into action.
Sacrifices
Episode number: 4
Overview: After a disaster aboard Sidonia, Nagate and his team are ordered to retrieve a valued weapon. He later defies orders to save a friend.
Adrift
Episode number: 5
Overview: Nagate and Shizuka, adrift in space, slowly run out of supplies as they await rescue from a departing Sidonia, which is too far away to send help.
Salutations
Episode number: 6
Overview: Nagate and his squad graduate as pilots and are quickly sent into combat when the enemy returns; Kunato explores Nagate's history.
Resolve
Episode number: 7
Overview: The enemy is revealed to be even larger and deadlier than previously believed, resulting in three squads engaging in a deadly fight.
Immortality
Episode number: 8
Overview: Nagate is blamed for a defeat and harbors guilt over a casualty; the early years of Sidonia are revealed.
Empathy
Episode number: 9
Overview: The Gauna find a distressing way to demoralize and out-fight the attack force. Nagate returns to Sidonia with a prize that may help in the fight.
Decisions
Episode number: 10
Overview: Pacifists endanger themselves by leaving the relative safety of Sidonia, while the enemy shows up larger and fiercer than before.
Collision
Episode number: 11
Overview: A large strike force encounters an enemy unit that takes them by surprise; Nagate does what he can to protect his friends.
Home
Episode number: 12
Overview: Nagate fights one-on-one with the heart of his enemy while the strike force does not fare well in its attack on the Gauna.