Tuatha de Danaan Crew vs. Gauron's Takeover
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Episodes 21–23 · A submarine turned against its own crew
Gauron escapes captivity with help from traitors inside MITHRIL, takes Kaname hostage and seizes control of the Tuatha de Danaan's command systems.
The Breakdown
This is not a normal boarding action. Gauron isolates much of the crew inside their own submarine while using its weapons and systems against them. Tessa works from captivity, Kaname becomes the mobile piece Gauron cannot completely control, and Sosuke and Kurz fight through the ship from the inside.
What changed
The Tuatha de Danaan spends most of the series as MITHRIL's safest and most technologically impressive asset. The finale works by turning that security inside out.
Debut: Ep 021 - Deep Trap
Sousuke Sagara (Arbalest) vs. Gauron (Venom) — Final Battle
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Episode 24 · Tuatha de Danaan hangar · Gauron chooses mutual destruction
Sousuke and Gauron fight inside the Tuatha de Danaan's hangar with almost no room for either Arm Slave to make a mistake. When Gauron realizes the takeover is lost, defeating Sousuke stops being enough. He activates the Venom's self-destruct system and tries to take the submarine with him.
The Breakdown
The solution is not a larger Lambda Driver attack. Kaname helps Sosuke recognize the practical answer: get Gauron's machine outside. Sousuke ejects the Venom from the submarine before it detonates.
Why it matters
The final victory is pure Full Metal Panic!. Impossible technology creates the crisis, but Sosuke and Kaname survive by understanding the actual problem in front of them.
Debut: Ep 024 - Into the Blue
Sousuke, Mao & Kurz vs. the Flight 208 Hijackers
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Episodes 4–6 · Hijacked class trip · Kaname extraction
Gauron's forces hijack the aircraft carrying Kaname's class and divert it to a military facility so Kaname can be isolated and examined as a suspected Whispered.
The Breakdown
This is where the school comedy abruptly proves it has always been sitting on top of a real protection operation. Mao and Kurz attack from outside while Sosuke reaches Kaname directly. Once their planned extraction collapses, the mission turns into survival with Kaname, Sosuke and Kurz trapped behind enemy lines.
What changed
Kaname finally sees what Sosuke actually is when the school uniform stops mattering. The bizarre transfer student is suddenly the most capable person in the room.
Debut: Ep 004 - Kidnap
Sousuke Sagara (ARX-7 Arbalest) vs. Gauron (Plan-1056 Codarl)
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Episode 7 · Arbalest's first battle · First successful Lambda Driver activation
Sousuke receives the ARX-7 Arbalest without understanding why the machine behaves differently from every Arm Slave he has used before. Against Gauron's Lambda Driver-equipped Codarl, normal attacks are not enough.
The Breakdown
Kaname's newly awakened Whispered knowledge gives Sosuke the clue he is missing. The Lambda Driver responds to a precise mental image rather than ordinary cockpit procedure. Once Sosuke stops trying to operate it like conventional equipment, the Arbalest finally answers him.
Why it matters
The victory is shared. Sosuke supplies the combat skill, Kaname supplies the understanding, and the Arbalest becomes useful only when those two things finally connect.
Debut: Ep 007 - Boy Meets Girl
Sousuke Sagara (Arbalest) vs. Plan-1051 Behemoth
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Episode 12 · Tokyo · A21's impossible Arm Slave
Takuma Kugayama activates A21's enormous Plan-1051 Behemoth and walks it into Tokyo behind a Lambda Driver powerful enough to shrug off conventional attacks.
The Breakdown
The Behemoth's size is also its flaw. Tessa and Kaname realize that the Lambda Driver is continuously supporting the machine's own impossible weight. Sousuke does not need the Arbalest to overpower a forty-meter monster in a straight contest. He needs to disrupt the system making that monster physically possible.
Why it matters
It is one of Full Metal Panic!'s best demonstrations that Black Technology does not erase engineering. The impossible machine still has a dependency, and understanding that dependency matters more than raw firepower.
Debut: Ep 012 - One Night Stand