Synopsis

Each night, when Ben falls asleep, his Crayons are magically transported to the dazzling world of Color City. When Yellow is accidentally left behind in Ben's room, however, she awakens two Unfinished Drawings: King Scrawl, a huge monster, and Gnat, Scrawl's sidekick. They follow Yellow to Color City, where they claim the enchanted Rainbow Waterfall for themselves. Color City will fade and the Crayon characters will disappear unless Yellow and her pals, Blue, Green, Red, and the twins, Black and White, can save the day.