Amphibius

Amphibius was originally a native of the Savage Land but was transformed by Magneto into one of his Mutates.

History
When Magneto disappeared, Amphibius and the other Mutates found a new master, Mister Sinister. After the defeat of Barbarus and Vertigo, Sinister dispatched Amphibius to capture Magneto and Charles Xavier who had become stranded in the Savage Land. He was successful until the company was attacked by an enraged elasmosaur, where Magneto and Xavier escaped.