The Morphin Grid

Ep. 9: The Jumprope That Erases People

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This article is about a/an episode in Choudenshi Bioman.

The Jumprope That Erases People (人を消すなわ跳び Hito o Kesu Nawatobi?) is the ninth episode of Choudenshi Bioman. This episode is notable as the final on-screen footage of Yuki Yajima as Mika Koizumi (Yellow4) with Mayumi Tanaka dubbing in her lines. The next episode, while with Mika as Yellow4, will not feature any footage of Yajima outside archival footage even with her as the main focus in the story.

In the Philippine Dub the title of the episode changed to "Doctor Man's Computer Menace".


Ryuuta becomes trapped within the dimension of a supercomputer by twin girl Mecha-Humans being used to capture children for Gear.


Children all over Japan have mysteriously gone missing. The Biomen suspect the Neo Empire Gear has a hand in this and are soon proved correct as the Empire has built a machine which projects a hologram of two Japanese twin girls who ask children to play jump rope and then capture them to power up the machine even further. If that's not bad enough, soon Blue3 is captured by the girls as well. The Biomen unfortunatly have no time to look for him as the Empire has unleashed another evil giant mecha. But without Blue3, Bio Robo's fighting potential is greatly diminished. Blue3 manages to turn the tables on the Empire by destroying the machine and saving the children who are no worse for wear. Blue3 unites with his fellow Biomen and finally ends the giant mecha's threat to their town!


to be added


  • This is the last episode to feature Mika Koizumi untransformed, as her character is written out completely at the end of the next episode.
  • It should be noted that the last few minutes of the episode is stock footage from Episode 4. This is presumadly due to the sudden departure of Yuki Yajima.
  • This is the first episode wherein Bio Robo is piloted by only four members of the Bioman.

DVD releases

Bioman DVD Vol 1

Bioman Volume 1, DVD cover

Choudenshi Bioman Volume 1 features episodes 1-11. [1]


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