Trapped by Vaughn's men at International Electromatics, the Doctor requests help from the Brigadier and UNIT, the United Nations Intelligence Taskforce. A UFO is delivering cocoons to the electronics firm – but what is inside them?
| Name | Type | Role | |
|---|---|---|---|
| Derrick Sherwin | Writer | ||
| Edward Dentith | Guest Star | ||
| Douglas Camfield | Director |