Undermine is a Jungle Planet Decepticon from the Cybertron portion of the Unicron Trilogy continuity family.

"I have no head. I have no head. I have no head..."

Undermine is one of Scourge's enforcers, keeping the Jungle Planet populace pacified, which has put him on his own brother Repugnus' enemy list. He serves as a silent spy and assassin for Scourge, hunting down dissidents, learning their secrets, then usually closing in for the kill. He is said to be one of the greatest hunters in the galaxy.

Japanese name: Dino Shout


Cybertron cartoon

Voice actor: Mark Oliver (English), Masafumi Kimura (Japanese)
Cybertron Undermine helpme

Just after finding out Grimlock finally saw Jurassic Park 3.

Centuries ago, Undermine appeared to a much younger Scourge as an innocent traveller who had been attacked. His mistreatment by extremely vague and undefined aggressors spurred Scourge to abandon Backstop's teachings and wage war against both the ineffectual rulers of Jungle Planet and the criminals that stalk the lawless lands. As Scourge grew in power, Undermine attached himself to the warlord, serving as Scourge's bodyguard alongside Brimstone. Honor

Cybertron Undermine beastmode

I'm a dinosaurus! Roar!

Much later, Undermine and Snarl were doing what they always did, standing around outside Scourge's temple when two strange beings appeared, walking toward the temple entrance. Moving quickly to bar their way, Undermine warned that the strangers should leave this sacred place, lest they face the consequences. When the large being, named Megatron, merely pushed them out of the way, Undermine leapt to attack, only to be effortlessly swatted aside. After Scourge appeared and Megatron explained his search for the Cyber Planet Keys, Undermine joined his fellows in transforming dramatically into beast mode... for no apparent reason as they immediately ceased hostilities afterwards. Search

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Cyber Key Bio

Scourge had a bodyguard prior to undermine, a nice guy named Shrapnel. This did not please Undermine, who proceeded to forge evidence of Shrapnel insulting the current administration. This evidence shortly left a vacancy Undermine was more than willing to fill.



CybertronGF Undermine toy

Whatever you do, don't leave him on display next to any T Rex transformers. You'll just find what they didn't get to eat.

  • Undermine (Scout-class, 2005)
    • Japanese ID number: GD-08
    • Accessories: Tail-mace, Jungle Planet Cyber Key
Undermine transforms into a robotic spinosaurus. Plugging a Cyber Planet Key into the back-end of his dino-mode sail reveals a spring-out blade, a gimmick also usable in robot mode as a horn. His dino-tail detaches to form a flail-weapon in robot mode, which plugs into holes in the tops of his hand-claws. He comes with a silver-bordered Jungle Planet styled Cyber Planet Key; the Hasbro version has the Key Code "s48a" stamped on the back.
The Hasbro and Takara versions of the toy have a pretty significant difference in their coloration: Hasbro's is a higher-contrast scheme, using a more subdued light-green with a deeper forest-green, while Takara's has a more vibrant light-green but uses a pale camo-olive green rather than the Hasbro version's dark-green.
This mold was also used to make Cybertron Repugnus.


  • Undermine (Scout-class, 2007)
    • Accessories: Tail-mace, Jungle Planet Cyber Key
Undermine was one of several Cybertron toys repackaged onto Universe cards and sent to discount chains like Kay-Bee Toy Works and Big Lots.
Some have been noticed to be defective, with either flawed Cyber Planet keys or a partially assembled main body.


  • Undermine is one of the few Transformers who canonically have more than two arms in robot mode. Though his dino-mode forelimbs fold up into his chest in robot mode, in the Cybertron cartoon, they are shown as being just as animate as they are when he's in beast-mode.
  • Let's face it; his Cyber Planet Key gimmick is "really" awkward.

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