Mischief' is the latest addition to a pony trekking stable. Davy looks after him during the school holidays and discovers that 'Mischief' was once a circus pony and reacts to the sound of music. This leads to incidents full of excitement and suspense.
| Actor | Role |
|---|---|
| PPaul FraserNot listed | Not listed |
| IIain BurtonNot listed | Not listed |
 Gerald SimNot listed | Not listed |
 Bill OwenNot listed | Not listed |