- A blue and white robotic warrior who captured the Galactabeasts so that he can become one of Scorpius' generals. He is a recolored hybrid of two Beetleborgs monsters. He has the head of Mean Green Cannon Machine and the body of Juukou B-Fighter monster Gorgodal (unused in Big Bad Beetleborgs).
A wasp monster used by Furio to seek out the Lights of Orion. He can generate earthquakes. Destroyed by the Galaxy Megazord.
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"The Magna Defender"
An unseen starfish-like engineer monster used by Treacheron to seek out the Lights of Orion. All that was seen of Starcog was its shadow. Once Leo chased it outside, Starcog wasn't seen
A jellyfish-like ashigaru monster. Chillyfish had the ability to make the entire colony of Terra Venture fall asleep with this ability not working on animals. Destroyed by Defender Torozord.
A red hammerhead shark and a green shark (who speaks in the style of Jabberjaw) with horns who skilled as ninjas and aided Treacheron against Trakeena. Destroyed by the Orion Galaxy Megazord.
A skeleton monster used by Scorpius to steal the Rangers' powers. He used the stolen powers to create his Skeleton Warriors. Destroyed by Defender Torozord.
"The Lost Galactabeasts, Part 2"/"Hexuba's Graveyard"
A bulky-scaled Bigfoot monster used by Deviot to control the Centaurus Megazord and the Stratoforce Megazord. After getting thrashed by the Centaurus and Stratoforce Megazords and Zenith Carrierzord, he is destroyed by the Orion Galaxy Megazord.
An octopus-like Komusō used by Deviot in an attempt to assassinate Trakeena. Destroyed by Trakeena, in "An Evil Game" and by the Red Ranger in "Hexuba's Graveyard".
A copier-themed robot warrior used to guard the laser dish that can destroy the Galactabeasts. He could duplicate the Rangers weapons and attacks. Destroyed by Stratoforce and Orion Galaxy Megazords.
A robotic rocket monster used by Barbarax to attack the Galaxy Rangers. Defeated by the Stratoforce and Galaxy Megazords, and then destroyed after Deviot drained his powers in order to return to normal.
A fire-breathing swordfish-like sea monster who accompanied Captain Mutiny to the planned execution of Leo and Damon. Rojomon was originally B-Fighter Kabuto monster Tokasuzura (unused in "Beetleborgs Metallix"). Destroyed by the Red Armored Ranger.
Titanisaur is a colossal dinosaur/dragon monster that serves Captain Mutiny. It was naturally giant, the same size as a megazord or any other giant monster. It carries Mutiny's castle on its back, can be directly controlled through a steering wheel in the castle, and has the capability to "swim" through space. It is also very strong, tearing the arms off several megazords. Its one weakness is that while Mutiny's castle is attached to it, Titanisaur gets overheated and must be cooled down by submerging in water. To better even Titanisaur's odds against the Rangers, Mutiny disengaged his castle from it and allowed the monster to fight the Rangers on its own. Even with this added advantage, however, Titanisaur was destroyed and even had its tail severed by the Torozord.
