The Ultimate TMNT Fanfic is a TMNT fanfiction-story written by Ninjatron in late-July 1999, and published at Fanfiction Net on 25 May 2000. It is a crossover of two TMNT universes.
Storyline
Starting in the 1987–1996 cartoonverse, Krang and Shredder attempt to get rid of the turtles by sending them to a parallell universe, using one of Krang's machine. The turtles end up in the Mirageverse, meeting themselves.