Billy's father despairs of Billy's obsession with making model prehistoric monsters. In Billy's imagination, however, the models take on truly monstrous proportions!
| Name | Type | Role | |
|---|---|---|---|
| Keith Waterhouse | Writer | ||
| Willis Hall | Writer | ||
| Roy Barraclough | Guest Star | ||
| Joan Young | Guest Star | ||
| Colin Jeavons | Guest Star | ||
| Stuart Allen | Director |