"The Ancient Art of Ninja Hide and Seek" is the fortieth episode (Episode 22B) of Rise of the Teenage Mutant Ninja Turtles. It first aired on October 26th, 2019.
Splinter teaches his sons the Art of Ninja Concealment.
- Battle Nexus Announcer (Nolan North) (debut)
- Big Mama (Lena Headey)
- Lizard Yōkai (Ben Schwartz) (debut)
- Yōkai bellhops
- Server yōkai (Nolan North) (debut)
- Tentacle yōkai (Josh Brener) (debut)
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- This episode, along with "Turtle-dega Nights: The Ballad of Rat Man", was leaked early online.
- This episode is one of Andy Suriano's favorite episodes of the first season of the series.
- At the end of the episode, it is revealed that Splinter knew Big Mama back when he was Lou Jitsu.
- This episode marks the final appearances in the series of both the otter bellhop and the owl bellhop. The fox bellhop would appear one more time in the second season episode "Many Unhappy Returns".