Rise of the Teenage Mutant Ninja Turtles S01 E31 Operation: Normal

Leo and Donnie try desperately to help April enjoy a quiet day with a new friend named Sunita. They learn that she is a slime Yōkai who uses a special amulet to turn into a human. They soon get targeted by the Foot Clan since the boots that Sunita's human form is wearing are part of the Kuroi Yoroi.