The TARDIS takes the newly regenerated Doctor to Earth to begin his exile. Brigadier Lethbridge-Stewart leads a UNIT investigation into a mysterious meteorite shower.
| Name | Type | Role | |
|---|---|---|---|
| Robert Holmes | Writer | ||
| Alan Mitchell | Guest Star | ||
| Tessa Shaw | Guest Star | ||
| George Lee | Guest Star | ||
| Helen Dorward | Guest Star | ||
| John Breslin | Guest Star | ||
| Antony Webb | Guest Star | ||
| Talfryn Thomas | Guest Star | ||
| Hugh Burden | Guest Star | ||
| Neil Wilson | Guest Star | ||
| Ellis Jones | Guest Star | ||
| Derek Martinus | Director |