In a parallel England, the Doctor tries desperately to convince his captors of the immense peril they are in. But they are convinced he is a spy. And penetration zero is getting close…
Name | Type | Role | |
---|---|---|---|
Don Houghton | Writer | ||
Roy Scammell | Guest Star | ||
Christopher Benjamin | Guest Star | ||
John Levene | Guest Star | ||
Derek Newark | Guest Star | ||
Sheila Dunne | Guest Star | ||
Nicholas Courtney | Guest Star | ||
Ian Fairbairn | Guest Star | ||
Olaf Pooley | Guest Star | ||
Douglas Camfield | Director | ||
Barry Letts | Director |