Rise of the Teenage Mutant Ninja Turtles (2018)

S2E21 Finale Part 1: E-Turtle Sunshine of the Spotless Mind (1)

The Turtles embark on a daring journey into Splinter's subconscious when an old and formidable enemy resurfaces, threatening their peaceful existence. As they navigate the intricate landscape of their mentor's mind, they encounter both familiar memories and daunting challenges that test their bond and resolve. With time running out, the Turtles must unravel the mysteries within before their beloved sensei falls victim to the darkness of his past.