This was the last episode with James Avery, providing Shredder's voice and was replaced by Townsend Coleman until the end of Season 7.
Brian Tochi, who voices Yoku in this episode, was the voice of Leonardo in the first TMNT live-action films in 1990, 1991 & 1993.
Final episode where Shredder is voiced by James Avery. In spite of this, he is listed in the credits after this episode.