Eine große Kampftruppe stößt überraschend auf eine feindliche Einheit. Nagate tut, was er kann, um seine Freunde zu beschützen.
The massive Gauna structure still remains on a collision course with Sidonia. It is discovered that the Gauna placenta has manifested around a dwarf planet and is planning to ram and destroy Sidonia. Yuhata tries to maneuver Sidonia out of the way, but all efforts to avoid a collision ends in failure as the Gauna also corrects its course accordingly (With the use of its tail) to remain on a collision path. The Captain orders that all guardian frames be outfitted with the new experimental placenta piercing weaponry. 48 frames are deployed with this weaponry and a anti-planetary missile is also launched at the Gauna. Yuhata reveals the plan to the pilots stating that the 48 guardians will separate into 2 platoons. Platoon 2's objective is to destroy the tail of the Gauna (The propulsion site) and Platoon 1's objective is to destroy as much placenta as possible, so the anti-planetary missile can reach the planet at the heart of the Gauna. Nagate and Izana are both positioned in platoon 1 and when they arrive ahead of the Gauna they have exactly 2 hours before the anti-planetary missile reaches the Gauna. The plan initially goes smoothly with both platoons making short work of the Gauna's placenta. Suddenly the placenta beneath platoon 1 morphs into hyggs cannons, and begins destroying many Guardians. Platoon 2 nearly destroys the propulsion system, but Benisuzume quickly appears and destroys all 24 Guardians in platoon 2. With the entirety of platoon 2 gone and almost half the Guardians in platoon 1 destroyed, defeat seems inevitable. Yuhata quickly develops a new plan, to activate Sidonia's super hyggs particle cannon and fire it at the head of the Gauna. This would then allow the remaining pilots of platoon 1 to enter the Gauna structure and destroy the 'Master Gauna' which supposedly controls the massive hive Gauna. With no other option the Captain agrees and fires the hyggs cannon. The episode ends as the hyggs laser approaches and hits the Gauna head.
Suuri iskuryhmä joutuu vihollisen yllättämäksi. Nagate tekee kaikkensa suojellakseen ystäviään.
Un énorme Gauna se dirige droit vers le Sidonia, et Nagate fait tout ce qui est en son pouvoir pour protéger ses amis.
Una squadra di incursione viene colta di sorpresa da un'unità nemica e Nagate fa tutto il possibile per proteggere gli amici.
シドニアの進路上に胞衣で小惑星を丸ごと飲み込んだ巨大奇居子が出現する。シドニアは斜め加速で衝突軌道を外れるが、奇居子も進路を転換。再び衝突軌道へ入る。衝突までの猶予がない中、纈は対惑星誘導飛翔体による小惑星の破壊を命令。しかし周囲の奇居子による直前回避や迎撃が予測されるため、衛人隊には飛翔体着弾までに周囲の奇居子を殲滅する任務が与えられた。長道は「シドニアの騎士」としての決意を新たにし、量産された超高速弾体加速装置と奇居子本体貫通弾を装備した衛人隊の一員として出撃する。しかし、圧倒的な奇居子本体の数と新兵器の訓練不足によって衛人隊は苦戦を強いられ、さらにそこへ紅天蛾が現れる。
시도니아를 향해 다가오기 시작한 초거대 연결형 가우나. 경사가속을 통해 긴급회피를 시도하지만 가우나는 믿기지 않는 운동능력으로 시도니아를 다시 사정권 안에 집어넣었는데...
El Gauna 542 es detectado en rumbo de colisión con Sidonia. Este espécimen masivo de tipo enjambre posee un tamaño descomunal, unas 8.000 veces la masa de Sidonia. Pese a todos los intentos de la tripulación de evitar el impacto, parece que el Gauna cambia de rumbo en respuesta, por lo que tendrán que idear otra estrategia.
Большая ударная группа сталкивается с вражеским подразделением, которое застает их врасплох; Нагатэ делает все возможное, чтобы защитить своих друзей.
