Invasion From an Alternate Dimension! The Mystery of Mugen Academy

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Episode Data
Mamoru conducts research on Professor Tomoe
Original Episode
Name (Kanji/kana): 異次元からの侵略! 無限学園の謎
Name (Romaji): Ijigen Kara no Shinryaku! Mugen Gakuen no Nazo
Name (Translated): Invasion From an Alternate Dimension! The Mystery of Mugen Academy
Name (Viz Dub): An Invasion from an Another Dimension: Mystery of Mugen Academy
Episode Number: 120
Director: Kounosuke Uda
Writer: Megumi Sugihara
Animation Director: Katsumi Tamegai
Air Date: January 7, 1995
Previous Episode: Awakening of the Messiah of Silence? Stars of Destiny
Next Episode: A Mystic Flower That Steals Hearts! The Third Witch, Tellu
First English Dub Episode
Name: Next in Line
Number: 113
Company: Cloverway
Air Date: July 21, 2000
Previous Episode: Goodness Eclipsed
Next Episode: Friendly Ferns

After Hotaru and her father disappear from their house, the Sailor Senshi infiltrate Mugen Academy, suspicious that it is connected to the Death Busters.


Chibiusa runs through rain-soaked streets, her mind flashing back to what the Outer Senshi said of the coming Silence, and the danger Hotaru represents. She arrives at Hotaru's house and bursts through the door without knocking. As she searches through the house, she finds all the rooms completely empty and bare. Someone touches her shoulder, startling her, but she turns to find Setsuna Meiou. She arrived ahead of Chibiusa, but found the house empty. Chibiusa accuses her of making Hotaru disappear. Setsuna denies this, but Chibiusa says that she hates her for what she has done.

The girls are at Mamoru's apartment, watching as he searches the internet for information on Professor Tomoe. He discovers that not only is Tomoe a professor at the elite Mugen Academy, he is its owner. Ami suggests they go to the school to investigate. Setsuna arrives then with a rain-soaked Chibiusa. Mamoru thanks her for bringing Chibiusa there, but as she tries to leave, he asks that she tell them all she knows about Mugen Academy. Setsuna does so, though she seems reluctant.

Setsuna tells them that Tomoe created the school three years ago, and since then many strange things have happened. Haruka and Michiru enrolled in the school in order to infiltrate and investigate. They and Setsuna believe Tomoe is affiliated with the Death Busters. She does not know if Hotaru is also a member; all Setsuna knows is that she is the reincarnation of Sailor Saturn. Chibiusa becomes upset and defends Hotaru as a good, kind girl who does not deserve death. Usagi wonders if there isn't another way to stop the Silence without killing Hotaru, who is a Senshi like the rest of them. Setsuna sadly observes that this is why she did not want to involve the others in this matter.

Down in his lab, Professor Tomoe receives a phone call from Mimete suggesting that their next target be Dr. Sergei Asimov, who is about to give a lecture at Mugen Academy on his theory of alternate dimensions. Tomoe is intrigued by the theory and the idea, but tells Mimete to hold off for now and await further instructions. Mimete is suspicious of this and eavesdrops on the lab via a listening device; she discovers Tomoe has lost confidence in her and is sending Tellu in her place. Furious, Mimete uses a voice synthesizer to trick Tellu into believing the Professor had cancelled the operation, and undertakes the mission herself, determined to win back the Professor's confidence.

The girls arrive at Mugen Academy and find that, because of the lecture that day, the school is open to visitors. In the meantime, Mamoru continues his investigation and discovers an article about a fire at Professor Tomoe's lab four years ago; the fire destroyed the building and killed everyone except the Professor and Hotaru, who emerged uninjured.

Once inside the school, the girls sneak through the halls looking for information, and Ami suggests that they look for the computer room. They are confronted by a stern security guard, and claim that they were looking for the lecture hall but got lost. The guard gives them directions and sends them on their way. Mimete passes by then, and the guard finds her suspicious and wants to see what she is carrying in a large sack slung over her shoulder. She refuses, and in the ensuing struggle, she tasers the guard. As Mimete continues onward, though, Tellu secretly watches her from a short distance away.

In the hall, Dr. Asimov gives his lecture about his theory of alternate universes, and it is broadcast on monitors throughout the building. Meanwhile, the girls split up to investigate separately. In the security room, Haruka and Michiru search for the entrance to the Death Busters’ headquarters. Setsuna joins them, and tells them that Usagi's group is also there investigating. Down in his lab, Professor Tomoe watches Dr. Asimov's lecture, laughing to himself about the accuracy of the lecturer's theories.

Hotaru sleeps on the throne of the Messiah of Silence, dreaming. In her dream, she remembers being in her father’s genetics lab, when something goes wrong with one of the machines and it suddenly explodes. Professor Tomoe cradles Hotaru's limp body, grieving, when a strange entity offers to save her life. The Professor says he will do anything, and the creature says that it will take over their bodies. As it enters Tomoe's body through his right eye, another explosion then destroys the entire building.

The lights in the hall suddenly go out in the middle of the lecture. Mimete appears on stage, then uses her Charm Buster to incapacitate the audience. She then unleashes her Daimon, U-Pasokon, on Dr. Asimov to steal his Pure Heart Crystal. The Inner Senshi arrive, and Mimete orders the Daimon to attack them. The Daimon and Senshi fight, and Mimete even briefly joins in the battle before unveiling a secret weapon: Eudial's Witches Electric Warp machine. Before she can use it, though, Tuxedo Mask and Sailor Chibi Moon arrive, and Sailor Chibi Moon knocks the Daimon down using Pink Sugar Heart Attack. Sailor Moon transforms into Super Sailor Moon and destroys the Daimon with Rainbow Moon Heartache.

When confronted by the Sailor Senshi, Mimete turns on the machine, which transfers her onto the giant television behind the lecture stage. She triumphantly declares that not only does it make her larger, it also increases her powers. As she is about to attack, though, Tellu appears, and observes that it is not nice to steal others' work. As she picks up the power cord, Tellu explains that Eudial never used that machine because if the television were unplugged while one was inside, they would be trapped in limbo forever. Though Mimete begs for her life, Tellu pulls the plug and then disappears, laughing. The Sailor Senshi are surprised to see such ruthless infighting within the enemy's ranks. Super Sailor Moon weakens and reverts back to Sailor Moon form, as the Outer Senshi look on from the balcony.

Episode trivia[edit]

  • Though Tellu and the other members of the Witches 5 had been seen in shadows and heard speaking in previous episodes, this was the first episode in which Tellu was seen clearly and named. Mimete also made her final appearance in this episode.
  • Germatoid's voice was heard in this episode, although he did not appear on-screen until episode 124.
  • In the Russian dub, Sergei Asimov still remained a Russian scientist.


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