Ninja Turtles Adventures #64: Hitler Gets Punched
Because Hitler getting punched never gets old. I threw in some extra Hitler ownage as a bonus.
Here's the short version: In the future, Hitler's brain builds itself a robot body and travels back in time to team up with himself and change history. The future-versions of Raph, Leo and Don follow.
Retrieving the brain, the Turtles then head back to the portal because Future-Don lost the remote. (Again.) Hitler decides to take issue with this.
I believe that is the aforementioned remote in the last panel, perhaps as foreshadowing that was never enacted upon.