Rescued by the Menoptra, Barbara is then captured by the ant-like Zarbi. The Doctor and Ian trace the missing TARDIS to a giant web city and encounter a mysterious intelligence.
| Name | Type | Role | |
|---|---|---|---|
| Bill Strutton | Writer | ||
| Catherine Fleming | Guest Star | ||
| Arne Gordon | Guest Star | ||
| Arthur Blacke | Guest Star | ||
| Richard Martin | Director |