A young boy named Ben loves to color with his crayons, but each night when he falls asleep, his crayons come to life and journey to the magical Color City. This vibrant world is where all the crayons live, work, and play. Among them is Yellow, a crayon who feels insecure about her abilities. One night, a new drawing of Ben's—a frightening unfinished monster named King Scrawl—accidentally gets brought to life. Yellow and her friends must race against time to stop King Scrawl from destroying Color City.

Yellow teams up with her fellow crayons Blue, Green, Red, and the others to overcome various challenges and obstacles in their quest. Along the way, Yellow begins to discover her true potential and strength. The crayons must rely on their individual skills and teamwork to save their world from the impending disaster. Their journey teaches them valuable lessons about bravery, friendship, and self-confidence as they strive to restore peace and harmony to Color City before it's too late.