Katy is a British television adaptation of Katy by Jacqueline Wilson. The Wilson novel is a modern retelling of What Katy Did by Susan Coolidge. It first aired on the CBBC Channel in March 2018. The series follows the Wilson novel with some minor tweaks: Dorry and Jonnie are absent, and Phil is five instead of two in their absence. Mr Robinson is instead Ms Robinson. Izzie is Dr Carr's sister who has moved in to care for the children in the original novel by Susan Coolidge.