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Parts of Keukegen have been used and it appeared in background of Zedd's palace during a party.
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Kasabake appeared with the Machine Empire in Zeo. Parts of him were later used.
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Nopperabou appeared in the background inside Zedd's palace and Machine Empire stadium.
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Ushioni didn't appear in MMPR but way later in Power Rangers Lost Galaxy in the episode where Karone disguised as Astronema to get the pink Quasar Saber.
Daimaou's siblings Yamauba and Daidarabotchi appeared in background. Yamauba's first form appeared with the Machine Empire, while her final form (inset) appeared as Dischordia in MMPR S3. Daidarabotchi appeared in "Countdown to Destruction" fighting the Alien Rangers.
OHRANGER MONSTERS
Bara Nightmare said to appear in the show.
CARRANGER MONSTERS
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JJ Jetton -- probably not used because ugly. They say he was seen on the show.
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RR Rii appeared as the toy Hammeron, well, misnamed Visceron but anyway, he didn't appear on the show.
MEGARANGER MONSTERS
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Ranger fought Owl Nejire in foreground but he was not named.
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Mole Nejire appeared in background of the Onyx bar in Lost Galaxy.
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Pig Nejire appeared in background crowd of Countdown to Destruction.
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Cicada Nejire appeared behind some Piranthrons in either Lost Galaxy or InSpace.
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Mushroom Nejire costume popped up on the show too.
GINGAMAN MONSTERS
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Dreddredder
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Chainsaws
GoGo Five
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Zairen--parts used for other monster and was named Mermatron in the
Lightspeed Rescue video game.
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Papetongu
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Godai -- didn't appear on the show but was named in the video game adaptation as "Abominus".
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Zombeast
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Golemzairen - appears in an advanced form in the episode "Sorcerer of the Sands."
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Golemburoogen
TIMERANGER MONSTERS
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Domiiro appears in a dark alley in front of Ransik.
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Kyoukatsu Banchou Furan is most famously known to fans as "Punky Bruiseter," he appears in early episode of Time Force but not named.
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Hydreddo appears in dark alley in front of Ransik.
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Gailmark
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Officer Arnold-K
UNNAMED WILD FORCE MONSTER
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Clock Org was not named, appeared as a resurrected monster but we never saw the Rangers fight him but it was obvious what his name would be.
UNNAMED NINJA STORM
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Tsukkomina the Comic Dialogue Ninja appeared in the last episode of Ninja Storm with a bunch of monsters and was not named.
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Jukukinoko the Brainwashing Ninja appeared in the last episode of Ninja Storm.
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Badogi appeared in the last episode of Ninja Storm.
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Madogi appeared in the last episode of Ninja Storm with a bunch of monsters and was not named.
UNNAMED DINO THUNDER
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Bakudandelion was not given a name
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Tensaikikku made a cameo in 'another realm.'
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Hakkarasunaipaa was not given a name.
DEKARANGER MONSTERS
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Lovelian Balance nicknamed 'debugger' but not named directly.
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Jergonian Sukeela
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Gedonian Uniga
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Yuilwerian Mime fought with a gaggle of monsters against the Dino Thunder Rangers in "Wormhole"
Baachiyo fought with a gaggle of monsters against the Dino Thunder Rangers in "Wormhole"
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Spiritian Byoi was a main enemy but had no name.
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Niwande, when Mora tries to escape the Shadow Ranger on Gruumm's ship, she draws this monster amongst other monsters in an attempt to stop him. He is quickly destroyed by the Shadow Ranger.
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Bandarean Jeeva, when Mora tries to escape the Shadow Ranger on Gruumm's ship, she draws this monster amongst other monsters in an attempt to stop him. He is quickly destroyed by the Shadow Ranger.
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Pyrian Kurachek, when Mora tries to escape the Shadow Ranger on Gruumm's ship, she draws this monster amongst other monsters in an attempt to stop him. He is quickly destroyed by the Shadow Ranger.
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Matthew, when Mora tries to escape the Shadow Ranger on Gruumm's ship, she draws this monster amongst other monsters in an attempt to stop him. He is quickly destroyed by the Shadow Ranger.
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Aladonian Gyanjava, when Mora tries to escape the Shadow Ranger on Gruumm's ship, she draws this monster amongst other monsters in an attempt to stop him. He is quickly destroyed by the Shadow Ranger.
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Guermerlian Byz Goa appeared but with no name.
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Kulernian Jellyfish was another of Mora's last resort monsters.
UNNAMED MYSTIC FORCE
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Ghoul appeared briefly as a gatekeeper, he was the main one to introduce the Mystic Fighters but the monster was changed.
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Troll and Stone Troll were not named.
UNNAMED PROO MONSTERS
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Majority of these monsters were not named at all. Madness Weather above.
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Great Evil Dragon Dold
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Zukangami
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Shirubegami
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Kanadegami
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Nendogami
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Akutagami appeared unnamed among other monsters in "Things Not Said"
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Mogari appeared unnamed among other monsters in "Things Not Said"
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Golem appeared unnamed among other monsters in "Things Not Said"
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Prince appeared unnamed among other monsters in "Things Not Said"
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Super Shizuka of the Wind appeared unnamed among other monsters in "Things Not Said"
UNNAMED JUNGLE FURY
Mukoua appeared in the last episode of Jungle Fury.
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Tsuneki appeared in the last episode of Jungle Fury.
UNNAMED RPM MONSTERS
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Bombe Banki
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Kama Banki
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Boring Banki
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Baloon Banki
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Oil Banki
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Manhole Banki
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Uzumaquixote
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Dowsing Banki appeared in "And Action..." episode, was not named, was called 'her' by Ziggy but grunted with a male voice.
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Dumbbell Banki
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Ketti Banki