This episode is the last episode of Season 3 focusing on Catboy.
This is the first time Romeo works with the PJ Masks to defeat another villain.
However, he eventually betrayed the help by threatening Catboy and Gekko, then sends Night Ninja and the Ninjalinos flying out of the Sky Factory, causing the former two and Owlette to save them.
Although Night Ninja and the Ninjalinos are the main antagonists of the episode, at the end of the episode they work with the PJ Masks when Romeo sent the Ninjas and the PJs out of the factory. They briefly work together but only to save each other.