The Donatello Clone is a clone of Donatello created by the Turtle himself in order to delegate his workflow. However, he had made an error that caused his clone to be ten times more intelligent than he was, and ten times as adept at fighting. Furthermore, the clone had deep contempt for Donatello and wanted recognition as his superior.
Since he had no intention of doing Donatello's scut-work, the clone beat up Donatello, tied him up and threw him into a closet. He set out to enjoy himself, but immediately earned the ire of the other Turtles by showing his open contempt for them. He then was caught by Rat King and Pinky McFingers, and decided to work for McFingers by building a new cloning machine and flooding the city with rats. His only stated goal was receiving due recognition for his genius, and he scorned material rewards.
When the Ninja Turtles sought to defeat the clone and rescue April, he cloned the other three Turtles as well. He and the other clones are destroyed when the real Donatello tricks him into reversing the cloning device.
He appeared only in Donatello's Duplicate.