Retromutogen Gun (Archie)

The Retromutogen Gun in the Archie Comics is a deviced used by in Heroes in a Half-Shell!, Part 3.

After hijacking the television set, he tells them it can restore  into Human again. He warns the Ninja Turtles that he must go alone, because the Retromutogen Gun can restore them into ordinary turtles again.

Splinter breaks into the, while the Ninja Turtles fight. Inside the Technodrome, a fight between Splinter and Shredder begins. Shredder knocks out Splinter, and heads to the streets of New York City to use the Retromutogen Gun at the Ninja Turtles.

However, Splinter manages to follow Shredder to street level and destroy the Retromutogen Gun by throwing his.