|“||I don't do Overflow, I go Undertow!||„|
|~ Undertow to Four Arms.|
Undertow is a Mutant Cascan Hybrid and one of the Antitrix aliens in the 2016 Ben 10 series.
Undertow looks like a green Cascan with extra machinery and watertubes on him. Having larger arms than a regular Cascan.
Ben 10 (2016)
Undertow returned in the episode You Remind Me of Someone, where after meeting the Forgeti, Kevin turned into him and Dark Matter, thinking that he was Ben and so went to fight against Ben who thought he was Kevin. The two turned back to normal after this.
Undertow also appears in the episode Adrenaland Jr., where after Kevin turned into Bootleg to cause havok across the theme park. He later turned into Undertow to fight against Ben and later turned back into Kevin after the day was over.
In the episode The Greatest Lake, Kevin turned into Undertow to fight against Hex, only for Hex to possess and take control of him. Kevin later turned into Bootleg after Hex lost his control over him to help Ben fight against the Wizard.
Undertow also appears in Ben 10 versus the Universe: The Movie, where Kevin would turn into him to fight against and Escape from Vilgax.