 is a children's stage musical with book and lyrics by Andy Stanton and music by Jim Fortune, based on Stanton's children's book of the same name (as part of the "Mr Gum" series).The musical made its world premiere in the Dorfman Theatre at the National Theatre, London, beginning previews from 25 July with a press night on 31 July, running until 31 August 2019.It is directed by Amy Hodge with set and costume designs by Georgia Lowe, musical direction by Tarek Merchant, lighting design by Lee Curran, choreography by Fleur Darkin, sound design by Carolyn Downing and puppetry by Jimmy Grimes.