Super Weapon R-1 (超兵器R1号 Chōheiki Āru Ichi-gō) is the twenty-sixth episode of Ultraseven. The TNT dub renamed this episode as The 8,000 Megaton Mistake.


Two Ultra Guard scientists, Doctors Segawa and Maeno create a new devastating weapon -- the anti-planet device they christen the R-1. Even in its infancy, the R-1 is said to have the power of 8,000 Hydrogen bombs. With plans to build an even more deadly R-2 device, it is decided a test of the weapons capabilities will be done on the supposedly uninhabited Planet Gyeron, a minor planet in some faraway galaxy. The test proves successful, but a giant flying creature doesn't take too kindly to its home being destroyed. Making its way to Earth, the monster attacks cities and emits radioactive ash. Ultraseven engages the beast in battle.


Suit Actors

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




Home Media

  • Ultraseven Volume 7 Features Episodes 26-29.


  • As of March 2011, this episode has been banned from television in Japan due to the Fukushima Daiichi nuclear disaster. This is due to a scene where Gyeron wipes out a power plant with a giant wave after he lands in the sea. This makes Gyeron the second of two characters from Ultraseven to be banned from reappearing, with the other one being Alien Spell. However, Gyeron still appears in stage shows, unlike Spell, who only appeared in their debut episode. The episode is also readily available online, and appears to still be popular among both American and Japanese viewers.
  • This episode is a satire on the Nuclear Defense Strategy during the Cold War.
  • The figurative statement quoted by Dan, "a lonely marathon you continue spitting out blood", was later used in Heisei Ultraseven 1999 episode, "Legend and Glory", to cite TDF's ongoing implementation of Friendship Plan agression plot following Furuhashi's demise at the hands of Alien Valkyrie.
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 Solar Energy Strategy | Ultraseven the Ground of the Earth Aliens
Ultraseven 30th Anniversary Memorial Trilogy
Lost Memory | From Earth Forever | Betrayal of the Sun
The Final Chapters
Legend and Glory | The Large Flying Iron Lump | The Day the Fruit Ripens | Consequences of a Promise | The Imitated Man | I Am an Earthling
Ultraseven 35th Anniversary: EVOLUTION
Dark Side | Perfect World | Neverland | Innocent | Akashic Record
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