From Raxacoricofallapatorius with Love (TV story)

Overview
This will mark the first spin off to have a special mini episode with a special guest Ronnie Corbett as well as K-9 will be back which probaly mean John Leeson would come back for the voice. As well as a source said that a old enemy would return (possibly the Graske again, however sarahjane.tv said it would feature "an attack by the rednosicles").

The title and story information were released on the BBC website.