"Come and Learn with Pibby!" is a short made by Adult Swim that serves as a potential proof of concept/pilot for a larger project (perhaps a movie or a series). It stars Pibby from the fictional children's educational show "Learning with Pibby" whose world is destroyed by a mysterious, glitchy ooze that invades her universe and corrupts it. She escapes to other TV shows, but the darkness is spreading across the animated multiverse so she must do what she does best: learn. In this case, learn how to be a hero and save the day! It is only a little over 2 minutes long and a really fun watch for fans of weird horror comedy stuff, and it features cameos or references to shows from throughout Cartoon Network and Hannah Barbera history as well as Easter Eggs to a few Nickelodeon shows. While more lighthearted and fun cartoon crossovers such as Fairly Oddparents: Channel Chasers inspired the land itself, for Halloween Horror Nights the nightmarish Pibby's Apocalypse cartoon crossover takes center stage.

(If you haven't seen the short and are interested, it is included below but it is not required viewing to understand the concept of a scarezone where cartoons are glitching out and are creepy)