A mysterious mecha hovers silently over the desert, prompting a tense standoff. Meanwhile, at a secret Galactor base, five ruthless trainees annihilate the old Blackbirds to earn their place in Katses twisted plans. Just as the G-Team reels from the fake-out, a real threat emerges: ISO bases worldwide are under siege by a swarm of killer whale mechas. An action-packed beginning to the third arc of Gatchaman!