The Incredible Shrinking Turtles

The Incredible Shrinking Turtles is a season 2 episode of the 1987 Teenage Mutant Ninja Turtles cartoon. It was also adapted by the TMNT Adventures Archie Comics in 1989.

Plot
While the turtles practice in the Central Park, and extraterrestrial spacecraft crashes onto Earth. The pilot leaves in an escape pod, which crashes into the water of a nearby lake. He tells the turtles that three fragments have also crashed onto Earth.

Shredder follows the turtles, and tracks down one of the fragment. It shrinks them.