England, the 12th century. Robber baron Irongron is recruited by Linx, a Sontaran warrior whose starship has been forced down on Earth. Linx is forced to use a time-travel device to steal resources and scientists from the future to repair his ship, but in doing so involves UNIT and the Doctor...
| Name | Type | Role | |
|---|---|---|---|
| Robert Holmes | Writer | ||
| Sheila Fay | Guest Star | ||
| June Brown | Guest Star | ||
| Gordon Pitt | Guest Star | ||
| Donald Pelmear | Guest Star | ||
| John J. Carney | Guest Star | ||
| Alan Bromley | Director |