Ok, so I'm making a cartoon series that has it's own "cartoon universe" type thing. The characters travel to different worlds, both in the real world & animated world. So far, I've been able to get a small crossover idea with PivotsXXD (who created Stu-boy & Piv-boy) as well as the idea of having a "Newgrounds world" featuring Tankmen, the Clocks, Madness etc.
Does anyone have any other cartoon series/ worlds (not just from NG) that they think would be cool to introduce in this series? I have more info on the series here -> https://www.kickstarter.com/projects/vyronixstudios/threefold-animated-series
I REALLY love crossovers tbh.