Each night, when Ben falls asleep, his Crayons jump into their magical Crayon Box that transports them to their home in Colour City, a world of dazzling hues, soaring fantasy and the whimsy of childhood. This land is fed by an enchanted rainbow and waterfall that provides the City and its citizens with color. When Yellow, our timid heroine, is accidentally left behind in Ben's room, she inadvertently awakens two Unfinished Drawings: King Scrawl, a huge, powerful, mute monster and Gnat, Scrawl's motor-mouthed, overactive sidekick. In search of colour for themselves, they follow Yellow to Colour City, causing panic and concern. If Scrawl and Gnat can claim the waterfall for themselves, Colour City will fade, and along with it, our lovable crayon characters will disappear. It's up to Yellow and a motley crew of Crayons, bodacious and brave, Blue, meticulous, fussy Green, satirical Red, pessimistic Black and overanxious White to save the day. Meeting with fantastical creatures and fun adventures along the way, Yellow discovers she has more courage and strength than she knew and learns to believe in herself and to count on the support of her friends. Replete with valuable life lessons, this enchanting story will entertain and inspire in a stunningly rendered and utterly unique animated world.