Everyone's favorite purple dinosaur embarks on an exploration of primary colors, spending the day with his friends collecting objects of a red, yellow, or blue hue. Not all of these objects are ordinary, however, including a haystack and a flying pig! Singing and dancing through the colors of the day, Baby Bop even donates her yellow blankey for the occasion. She comes to find out that her blanket was irreplaceable, but the fun, frolics and learning never stop!