Rise of the Teenage Mutant Ninja Turtles

Season 2, Episode 1

Episode Title: Flushed But Never Forgotten

Air Date: 2019-10-12

Overview:

The Turtles have a secret that comes back to haunt them in the form of Splinter's pet goldfish Piebald who was accidentally flushed down the toilet and mutated after eating an Oozesquito.