An underwater alien adventure or a blast from the past? Looks like Keroro and his friends aren't the only ones planning to invade Earth, it turns out there's another alien force wrecking havoc with a monstrous new weapon! When Fuyuki, Momoka and the others go to investigate the strange ocean sightings, their island trip doesn't turn out anything like they expected. What will happen when they join forces with the Keronians to fight these strange assailants?
- Full-Length Feature: Lost In the Abyss the Monster and Eden
- The Aircraft Carrier and the Sea Fireflies
- The Abyss and the Prince
- The Nuptial and the Siege
- The Stage and the Costumes
- The Activation and the Pulse
- Lost In the Abyss