The TDF start development on Project Blue, a plan to wrap a magnetic barrier around the Earth and moon to repel alien invaders. In an effort to sabotage the project, Alien Bado, the self-proclaimed Emperors of the Universe, kidnap the project's lead, Professor Miyabe. When the Ultra Guard are unable to contact the professor, they send Dan Moroboshi and Anne Yuri to investigate.
Plot
An alien ship attempts to enter Earth's atmosphere but crashes into an invisible barrier. Meanwhile, the Ultra Guard discuss the TDF's latest project, Project Blue, which aims to project a barrier of magnetic force around the Earth and moon to keep alien invaders out. Elsewhere, the project's lead, Professor Miyabe, encounters a figure on the road who disappears before he can offer them a ride.
At his home, the professor gifts his wife Grace with a dress, but their quiet evening plans are interrupted when the ground briefly starts to shake. Professor Miyabe comforts his wife and the two go to bed, but is awoken in the middle of the night by a vision of a grotesque creature. At Ultra Guard HQ, Kiriyama receives a report from Amagi and Soga, who are on the moon, about a failed sabotage attempt by an unidentified alien.
Grace leaves their home early to arrange a charity party, leaving Professor Miyabe alone for the day. While preparing breakfast, an entrance to an underground complex reveals itself in his kitchen. The professor investigates and is immediately captured. He awakes strapped to a table, and a voice introduces itself as a member of the Alien Bado, the self-proclaimed Emperors of the Universe who controlled the solar system long before the Earth sustained life. The alien demands that the professor hand over the plans for Project Blue.
The Ultra Guard discover a high amount of radiation in the atmosphere, and Staff Officer Takenaka corroborates evidence of something exploding while attempting to enter the Earth's atmosphere, suggesting alien activity. Grace arrives to an empty home and searches for Professor Miyabe. When he refuses to give up the plans, the Alien Bado attempts to coerce him by repeatedly terrorizing his wife. She attempts to call the Ultra Guard but finds the phone line cut.
HQ attempts to contact Professor Miyabe to warn him of the potential threat and become worried when they're unable to reach him. Kiriyama instructs Dan Moroboshi and Anne Yuri to check on the professor. After hearing Grace's screams, the two burst into the professor's house and neutralize an Alien Bado before it can attack her. Dan transforms into Ultraseven and discovers an entrance to the aliens' base hidden behind a mirror.
The Alien Bado begin to retreat, taking Professor Miyabe as hostage before activating a planet-destroying bomb. Ultraseven attempts to sneak into the aliens' ship, but is caught in the hatch. He grows to giant size instead and carries the ship to the mountains, and the Alien Bado similarly enlarges to fight him. After a short battle, Ultraseven kills the giant alien by throwing it against the ground. He returns to free the professor and teleports him home before flying the bomb into space.
Anne asks Professor Miyabe where he hid the plans for Project Blue, and he reveals that they were encoded into the dress he gifted Grace. Dan rejoins the group and reports their victory to Kiriyama. Anne remarks that Ultraseven did all the work, and Kiriyama jokingly chides Dan as everyone laughs.
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According to an interview with episode director Samaji Nonagase by Yoichi Iwasa:[2]
This episode combines the suspenseful style of a Hitchcockian thriller with alien elements. Dr. Miyabe's wife, Grace, was inspired by the atmosphere of foreign films and is reminiscent of James Bond films.
Tetsuo Kinjo suggested the idea of a secret alien base beneath Dr. Miyabe's house to Nonagase, along with the concept of Project Blue. Nonagase noted that, although it might seem strange for Alien Bado—who had threatened Miyabe, to plan the destruction of Earth with a bomb, this reflected Bado's impulsive and short-sighted nature.
The final fight scene was the result of a collaboration between the special effects team and Koji Uenishi. Although the battle was not one-on-one, the team clearly enjoyed creating it. Given the intense horror atmosphere, Nonagase felt that an exaggerated fight scene was appropriate.
The episode's original title was "Earth Extinction Plan"(地球絶滅計画, Chikyū Zetsumetsu Keikaku), but it was changed to the current title in both the preparatory and final drafts.
In these drafts, the aliens were not named Bado. They were referred to only as "a certain alien" or "an ugly alien."
In the draft, Bado revealed their "Earth Extinction Plan," which involves using a bomb to destroy the planet and erase it from the universe.
The scene in which Anne attempts to follow Seven but crashes into a mirror was likely inspired by the water mirror scene in the 1950 French film Orpheus.[3][4]
Linda Mabrey (also known as Linda Malsom), who played Grace, was born in Anderson, Indiana. In the 1960s, she lived in Japan briefly to pursue acting and modeling. According to a 2018 interview with Brett Homenick:[5]
Marston did not remember how she had been cast, assuming that her agency had arranged it. Initially, she struggled to project her voice on set, but after repeated takes, she managed to raise it sufficiently.
She remembered the staircase scene, in which she descended a staircase holding a candle in the dark. Her scream in that scene was genuine because she had been truly scared. Although she saw her role as just a job, Marson found the experience interesting, particularly the Japanese crew's special effects techniques, which differed greatly from those she had seen in the U.S.
Marston was impressed by the special effects, although she rarely saw the Ultraseven suit actor. She remembered Akiji Nomura, even though she had forgotten his name. She noted his kindness during a scene in which they turned off the lights in bed. She did not recall the other actors.
The outdoor filming took place near Mount Fuji, where Marson stayed in a small hotel with the other crew members. She recalled one or two people drinking and acting inappropriately. The shoot likely lasted a week or ten days. One night, a few drunk crew members entered her hotel room, but she promptly kicked them out. She was unsure if they were producers or lighting technicians. She felt they were just joking around and didn't hold a grudge.
Marson knew some Japanese, which she wrote in Romaji and translated into English. While working on Ultraseven, she first learned the word "anata," initially thinking it meant something like "darling." She delivered her lines in Japanese on set, but another actor dubbed them later.