One Saturday morning John wakes up convinced that there is something very big & invisible on the end of his bed. It transpires that this invisible creature is a giant who won't let John measure it & writes the letters IVO on the mirror when asked its name. John decides to call the invisible giant Ivor & together they get up to lots of mischief, especially at John's school & in the park. Also included is the 30 minute film ' Here Comes the Bogeyman' which charts the magical work of children's writer Raymond Briggs with clips from ' The Snowman', ' Father Christmas' & ' The Bear'.