This is the first time that Luna Girl and Night Ninja are shown in one episode together, as well as the first time they work together (if Luna Girl being a referee can be considered teaming up with a villain).
Luna Girl nicknames Night Ninja as "Ninjy".
The four competitions between Catboy, Night Ninja, and later Luna Girl went as follows:
An egg-and-spoon race, which Night Ninja won due to Catboy dropping the egg by using Super Cat Speed.
A three-legged race, which Catboy, Gekko and Owlette won when Catboy's tail hit the finish line first.