Story's End!

Go, Go, Mutant Turtles! is a TMNT Adventures issue, published in March 1996. It is the third issue of The Year of the Turtle.

Plot
The turtles fight Shredder, and the artifact is revealed to be a crystalized form of mutagen. At the end, it's revealed that the boy Splinter tells the story for is Michelangelo, changed back into mutant turtle-form.