The Secret of the Lake
Ultra Seven, Episode 3
Eleking v Ultraseven I
Air date 10/15/1967
Screenplay by Tetsuo Kinjo
Directed by Samaji Nonagase
Special skill director Koichi Takano
Episode Guide
The Green Terror
Respond, Max

The Secret of the Lake (湖のひみつ - Mizūmi No Himitsu) is the 3rd Episode of Ultraseven.


An unidentified object has landed somewhere near the Kiso Mountains. Dan and Furuhashi are sent to find any wreckage, or signs of life. They find a young girl swimming in Lake Azuma as well as a spaceship nearby. Both men go aboard the craft where they find a girl that looks exactly like the one they saw swimming in the lake. The two men are temporarily knocked unconscious by gas emitting from the walls of the ship. When Dan comes to, he realizes the Ultra Eye is missing. Without it, he can't turn into Ultraseven.

Not long after, a giant monster named Eleking emerges from Lake Azuma. Till he can locate the Ultra Eye, Dan uses one of his space capsules to send Monster Miclas to battle the amphibious Eleking, a beast under the control of two insectoid twin Aliens know as Alien Pitts posing as little girls with plans to wipe out all of mankind.


Suit Actors

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


DVD Release

  • Ultraseven Volume 1 features Episodes 1-4.


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