Scumbug and Anthrax make their first and only appearance in this episode but ironically they claim to have encounter the Turtles before.
This episode is released onto DVD as part of the Raphael Slice of season 7.
The turtles made Walt the sixth turtle in The Missing Map. If Splinter doesn't have that many human allies and is calling in a kid like Zach to help fight the bad guys, why not his older brother too?
Final appearance of Leatherhead, Slash, Tempestra, Scumbug, and Chromedome.
Although Zach appears for the final time in this episode, Casey Jones returns in "Cyber Turtles" during Season 8.
Final appearance of Zach, the "Fifth Turtle."