Erin was a human girl living in the Labyrinth in late 1996. In December of that year, Erin was abducted by Sevarius and Fang and was injected with a mutagenic formula causing her to become a human-turtle mutate. After she was freed from Sevarius by the Redemption Squad, she returned to live in the Labyrinth.
Erin resembles a anthropomorphic turtle and possibly has the ability to retract into her shell, though this is uncertain.
Erin has a younger brother named Benny who was also made into a mutate.
- "Louse" (First Appearance)
Erin is named after Greg Weisman's daughter, Erin Weisman. She and her brother Benny both chose what kind of animals their comic counterparts would be crossed with as mutates. They also approved the final designs. Greg Weisman came up with the theme of all four mutates having some form of natural armor based on their choices.