Ep 13. Notes from the Underground (1)

The episode "Notes from the Underground (1)" is the thirteenth episode of the first season of the Teenage Mutant Ninja Turtles series. In this episode, the turtles discover strange pipes beneath the city, which they believe are related to the recent emergence of a group of mutants.

As they explore the underground tunnels, the turtles encounter a group of creatures that call themselves the "Mole People." These creatures are humanoid, with long claws and fur covering their bodies. They live in a hidden city beneath New York, and have been living there for centuries, cut off from the rest of the world. The turtles are initially suspicious of the Mole People, but soon learn that they are not a threat.

It soon becomes clear that the Mole People have been affected by the same mutagen that created the turtles. However, instead of gaining humanoid forms like the turtles, the Mole People have evolved to better survive in their underground habitat. The turtles also learn that the Mole People have been keeping an eye on the surface world for centuries, and have noticed the recent influx of mutated creatures.

The episode ends with the turtles learning that the leader of the Mole People, a wise old creature named Mortu, wants to speak with them. The turtles are tasked with figuring out how to find Mortu and begin what promises to be an exciting adventure in the underground tunnels.

Overall, "Notes from the Underground (1)" is an exciting episode of the Teenage Mutant Ninja Turtles series that introduces an interesting new group of mutants and sets up some intriguing plotlines for future episodes. Fans of the series will definitely not want to miss this one!