Pursue the Sea Bottom Base
Ultraseven, Episode 21
Iron-Rocks 0
Air date 02/25/1968
Screenplay by Onisuke Akai
Directed by Toshitsugu Suzuki
Special skill director Jun Ooki
Episode Guide
Destroy Earthquake Epicenter X
The Human Farm

Pursue the Sea Bottom Base (海底基地を追え - Kaitei Kichi o oe) is the 21st Episode of Ultraseven.


A cargo ship has gone missing at sea and the Ultra Guard are sent to investigate this newest disappearance. They report to General Yamaoka (Kenji Sahara) that witnesses saw what looked like the famous WW2 Battleship Yamato rising from the sea. Furuhashi and Amagi set off underwater in the Hydrangers and find some sort of flying saucer shaped like a starfish. Meanwhile, the weapons-laden Yamato-like warship Iron Rocks surfaces once more and engages the Ultra Guard in a massive fire fight. Learning that the alien Yamato clone will self-destruct, Ultraseven flies into action.


Suit Actors

  • Ultraseven (ウルトラセブン Urutorasebun): Uenishi Hirotsugu (上西弘次 Hirotsugu Uenishi)


DVD Release

  • Ultraseven Volume 5 Features Episodes 18-21.

The Invisible Challenger | The Green Terror | The Secret of the Lake | Respond, Max | The Erased Time | Dark Zone | Alien Prisoner 303 | The Targeted Town | Android Zero Directive | The Suspicious Neighbor | Fly to the Mountain of Evil | From a Planet With Love | The Man Who Came From V3 | The Ultra Garrison Goes West, Part 1 | The Ultra Garrison Goes West, Part 2 | The Eye That Shines in the Darkness | Underground Go! Go! Go! | Escape Space X | Project Blue | Destroy Earthquake Epicenter X | Pursue the Sea Bottom Base | The Human Farm | Revenge of 300 Years (Unaired episode) | Search for Tomorrow | Return to the North! | Showdown at 140 Degrees Below Zero | Super Weapon R-1 | Operation Cyborg | The 700 Kilometer Run! | The Forsaken Earthman | For Whom Takes the Glory | The Devil Who Dwells in a Flower | The Wandering Planet | The Dead Invaders | The Vanishing City | Horror on the Moon | The 0.1 Second Kill | The Stolen Ultra Eye | The Courageous Battle | The Seven Assassination Plan Part 1 | The Seven Assassination Plan Part 2 | The Challenge from the Water | Ambassador of the Nonmalt | Nightmare on Planet 4 | The Terrifying Super-Simian | The Boy Who Cried Flying Saucer | The Duel: Dan vs. Seven | Who are You? | The Greatest Invasion in History Part 1 | The Greatest Invasion in History Part 2