Directed by Samaji Nonagase. Written by Bunzo Wakatsuki. Airdate Feb. 18, 1968.

There are several Ultraseven episodes that feel as if they were reworked from unused Ultraman scripts (something that did happen with “The Strolling Planet”). “Destroy Earthquake Epicenter X,” from what I can tell, was originally written for Ultraseven, but the Ultraman vibes are strong: an episode focused on a giant monster and high-tech equipment rather than alien schemes or a strange science-fiction twist. Ultraseven’s stories are usually alien-themed, but this episode feels as if the alien invader could easily have been cut and the script left as a terrestrial kaiju story.

Written and Directed by Samaji Nonagase. Airdate Feb. 11, 1968.

Professor Miyabe (Akiji Nomura) has invented a magnetic defense barrier, Project Blue, that will shield both Earth and the Moon from the barrage of alien invasions happening on a weekly basis. (At this point, the Ultra Guard is so familiar with these invasions that they know the preferred routes aliens take when launching attacks.) But Alien Bado, self-proclaimed “Emperor of the Universe,” is not going to have some Terrestrial Defense Barrier hinder their plot to explode Earth and eradicate the potentially deadly human race. The aliens covertly park their spaceship under Professor Miyabe’s home and kidnap him, threatening to murder his wife Grace (Linda Mabrey) if he doesn’t surrender the plans for Project Blue.