The Invisible Challenger (姿なき挑戦者 Sugata Naki Chōsen-Sha) is the 1st episode of Ultraseven.


Aliens from the planet Cool have kidnapped a number of humans for experimental purposes leading to an impending invasion of the planet Earth. The Terrestial Defense Force is sent to investigate and meets a mysterious wanderer named Dan Moroboshi who helps destroy the invading alien forces. No one knows his true identity, but Moroboshi transforms into Ultraseven, a silver and red superhero from another galaxy committed to protecting the Earth from monsters and alien threats.


The Ultra Garrison is ordered to investigate several mysterious disappearances, which are suspected to be the work of aliens. They are called together, and the captain, Kaoru Kiriyama, finds that two defence force members have also been mysteriously abducted. He takes this as a challenge by their enemies. Suspecting the aliens to be aware of their movements, he warns everyone to be on guard and notes that the enemy may be nearby.

Shigeru Furuhashi and Soga are deployed, while Anne Yuri and Amagi stay to study the actions of the enemy. While on the road, the former are stopped by a strange man, who tells them not to progress any farther. A police officer drives by and says nothing suspicious has been reported, and continues on despite Dan's warnings. His car vanishes.

Dan tells the two members of the Ultra Garrison that the Cool Aliens have been gathering human specimens and experimenting on them for years, and now intend to move into their plan for Earth domination and destroy the Ultra Garrison. Just then they are interrupted by bolts from the sky, and the two officers are wounded. They flee, with Dan at the helm, and return to base.

They report that they were attacked by an invisible spaceship. Just then, one of their screens is hacked and they are contacted by an Alien Cool. It tells them to surrender the Earth, or else the captive humans will be destroyed. After the leaders refuse to comply, the aliens begin their assault on Earth. At this direct assault, the leaders are completely unsure of how to proceed.

Anne Yuri suspects Dan might know something, and asks him how to defeat the aliens. He suggests that they spray the spaceship with paint to render it visible. Scientists work on making a device which which to do it, as radar tracks down the ship itself. When the device is ready, the Ultra Hawk No.1 departs with the team (as well as Dan) inside it. They manage to make the ship visible, and battle it. The aliens retreat, leading the Ultra Hawk to a rocky area where they manage to cause it to crash land.



Suit Actors

  • Ultraseven (ウルトラセブン Urutorasebun): Uenishi Hirotsugu (上西弘次 Hirotsugu Uenishi)
  • Windom (ウインダム Uimdamu): Sadao Sunohara (春原貞雄 Sunohara Sadao)


Ultra Warriors


DVD Release

  • Ultraseven Volume 1 features Episodes 1-4.


  • This episode was later featured in Ultraman Retsuden episode 85 "The Invisible Challenger! Ultraseven Appears!!."
Ultraseven Episodes
Ultraseven 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 Guard Goes West: Part 1 | The Ultra Guard 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
Heisei Ultraseven NTV Specials
Ultraseven - Operation: Solar Energy | Ultraseven - Planet of the Earthlings

Ultraseven 30th Anniversary Memorial Trilogy
Lost Memory | Eternal Earth | Betrayal Sun

The Final Chapters
Legends and Glory | The Sky-Flying Iron Colossus | The Day the Fruit Ripens | The End of the Contract | The Duplicated Man | I Am an Earthling

Ultraseven 35th Anniversary: EVOLUTION
Dark Side | Perfect World | Neverland | Innocent | Akashic Records
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