Men have just landed on the moon as David Jones starts upon his first year as a pupil at Croesdy Comprehensive School. The bullies who pick on him learn about his secret fears in order to make his life a misery. They picture themselves as astronauts in pursuit of David whom they link with the isolated man in the moon whose sea of tranquillity has been disturbed by the moon landing. The bullies torment him relentlessly until David is driven to the end of his tether and is tempted to resort to desperate measures.