Walt, envious of the attention his brother gets from the Turtles, steals a rare pouch containing the only physical map to the Turtles' secret lair.
The episode "The Lost Mine" (often associated with missing maps or documents) where Poirot investigates a murder linked to a missing mine map. [S3E40] The Missing Map
If you were thinking of a different series, "The Missing Map" is also: Walt, envious of the attention his brother gets
The plot centers on , the "Fifth Turtle," and his older brother Walt . Fans often point out the plot hole of
Fans often point out the plot hole of why the Turtles would even keep a physical map to their own home if they wanted to keep it secret.
The episode features a rare sequence where Michelangelo walks the boys through a convoluted path to ensure they can't easily find the lair again—showing the Turtles actually do care about security.