The Monster High G2 Frankie Stein How Do You Boo First Day of School Signature 2015 doll is a collectible item from the popular Monster High franchise by Mattel. This doll features the character Boo and is themed around school, making it a perfect addition to any Monster High collection. Released in 2015, this doll set includes the doll itself, allowing fans to bring a piece of the spooky and fun world of Monster High into their own home.