Undertow Engine is a race of creature in the Water Civilization.


Some Undertow Engines cards start with the word "Hydrobot" in their name.


Undertow Engines are robot-like shellfish, these crustaceans resemble crabs, shrimp, starfish, and hermit crabs. Controlled by Aquans and Cyber Lords, Undertow Engines are used as mobile forts and shock troops. When attacked, they respond by emitting bright sparks and supersonic or electromagnetic waves that disrupt their opponent's attack. Hydrobots are ancient technology and artifacts of the cyber lords' first experiments using artificial intelligence.

List of Undertow Engines


Hydrobot Crab (3RIS)


  • The Undertow Engine are the Kaijudo versions of the Cyber Clusters from the original Duel Masters franchise.

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