Underground Empire Tube

Category:Sentai Villains]]ire Tube was once a peaceful underground empire, corrupted by usurper Zeba, who now intends to rule surface world. They are the main villains of this series.

Earth Emperor Zeba
The leader of the underground Empire Tube who hates all human beings. His true form is the monster Lethal Doggler, whose parent was killed by the original Tube Royal family for attempting to take over the throne. Lethal Doggler the 1st managed to spawn an egg that resulted in Lethal Doggler the 2nd's birth. Lethal Doggler the first allowed his son to eat him to make his son stronger. Lethal Doggler the 2nd grew with nothing on its mind but revenge, disguising itself as Zeba and infiltrating his way into the Igam kingdom. Upon assuming the throne, Zeba corrupts it into a violent kingdom where strength rules all, and enslaves the underground humans. He soon reverted to his true form by the combination of Aura Power and the Igam Royal Family's power. He used the Maskman's Aura Power to enlarge with the intention to destroy the world. He was destroyed by the Galaxy Robo.

Earth Imperial Commander Baraba
A skilled swordsman and strongman of the Baluga tribe and rival of Igam, who always scoffs. He gets the Royal Underground Sword in the mid-episodes where he reveals his ultimate force of fury after his mother Raraba (played by Machiko Soga) was killed. After one failure too many, Baraba is sentenced to death by the Emperor Zeba and is told that he can only redeem himself by destroying the Maskman. He makes a deal with Kiros and gets the Princess Ial as a hostage without knowing that Kiros had other plans. When this happens, he is later betrayed by his underling Oyubu for despising the Emperor's methods. He challenged Red Mask into a final duel between the two of them. He was killed by Red Mask.

Earth Imperial Ninja Oyobu
A ninja of the Buyon tribe with red skin and large ears. He can throw fire from his hands and run at near-lightspeed. Being extremely loyal, he is Baraba's right-hand. However, he refused to assist Baraba in his final battle because he went against Zeba's word and acted by his own means. Consequently, this resulted in his master's death. Later on, he seems to rejoin the Underground kingdom. He was killed when the castle was launched.

Earth Imperial Prince/Princess Igam
The twin sister of Princess Ial. As eldest, Igam was raised as a male in order to one day take the throne of the Igam Royal Family kingdom. She holds a hatred for Ial for falling in love with an ordinary aboveground human, "smearing the Igam name", and despises Takeru for being the man responsible. She revives the Igam Dragon, who was a peaceful being who once served the Igam no matter what the situation, and forced it to fight with her against the Maskmen. Amongst her abilities is the Death Ring, an electrified force field which leaves her tired and drained of energy. She became a Buddhist nun in the finale of the series to repent for her sins, while leaving her sister to become the new heir to the Igam kingdom.

Earth Imperial Ninja Fumin
A female Ninja of the Fu tribe, she serves the Igam clan. A ninja trained in combat with the ability to throw shurikens and shoot fire from her mouth. Her abilities is rivaled by fellow ninja Haruka/Yellow Mask. She was killed in the Underground Castle while protecting Princess Igam from the collapsing boulders when the castle was launched. Earth Curiosities Beast Anagmas (地奇地奇獣アナグマス, Chiki Chikijū Anagumasu?, 1-50) - An overweight beast who knows all. As the wiseman of Tube, only he is allowed access to read the library of ancient documents and sacred writings regarding the history of the Tube civilization which is hidden deeply within caves underground. Only showed up twice before his death. He later intervenes with trying to keeping Zeba's origins a secret. However, he was killed by the Maskmen with the Jet Cannon. He is then enlarged and was destroyed by the Galaxy Robo.

Thief Knight Kiros
Though not a member of Tube, he once allied with it. Kiros had a love for Princess Ial and fell in the Hell's Wind to save her. He escaped it with his life by developing the Crescent Screw technique. With that technique, he was able to destroy the Shot Bomber. After this, he makes an agreement with Zeba in which after he will defeat the Maskman by any means if they let him have Ial. He steals the imprisoned Ial and kidnaps Oyobu and offers him any of the treasure he has stolen if he could melt Ial. Oyobu refuses and Igam and her army arrive shortly with orders to eliminate Ial and Kiros is mortally wounded in an attempt to protect her. He dies after seeing Takeru and Ial reunite. He lived and died for what he thought was love.

Energy Beast Okelampa
A bug/mollusk hybrid that emerges when the monsters of the Tube Empire were always destroyed by the Maskman. With its ray, the Doggler monsters were enlarged. The only dialogue spoken each episode by Okelampa, after tiring from firing his ray of enlargement, is "yare-yare" ("Good heavens!") His last appearance was in episode 50, when he enlarged Anagumas. What happens to him later is unknown.

Princess Ial
She is the twin sister of Igam, sent by Tube as a spy aboveground, when she met and fell in love with Takeru. When Tube's forces are ready to attack, she warns Takeru, but is captured by the Igua Dogler, who pulls her beneath the ground. Zeba later sentences to imprisonment in ice for her betrayal. Kiros also has feelings for Ial, though the feeling is not mutual. She was forced to leave Takeru to fulfill her duties as the new empress, though she still had feelings for him.

Ungler Soldiers
The black skinned foot soldiers with vines covering their faces. Their names are derived from "underground."