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Separated from the Doctor, Clara discovers a new menace from another dimension. But how do you hide when even the walls are no protection? With people to save and the Doctor trapped, Clara comes up against an enemy that exists beyond human perception.
Original Release
02/27/1971
Cast
| Name | Character |
|---|
| Jon Pertwee | Doctor Who / The Doctor |
| Roger Delgado | The Master |
| Nicholas Courtney | Brigadier Lethbridge Stewart / Alistair Gordon Lethbridge-Stewart |
| Katy Manning | Jo Grant |
| Richard Franklin | Captain Mike Yates |
| John Levene | Sergeant Benton / Sgt. Benton |
| William Marlowe | Harry Mailer |
| Patrick Godfrey | Major Cosworth |
| Neil McCarthy | Barnham |
| Johnny Barrs | Fuller |
Directors
Writers
Creators
Cast
| Name | Character |
|---|
| Jon Pertwee | Doctor Who / The Doctor |
| Roger Delgado | The Master |
| Nicholas Courtney | Brigadier Lethbridge Stewart / Alistair Gordon Lethbridge-Stewart |
| Katy Manning | Jo Grant |
| Richard Franklin | Captain Mike Yates |
| John Levene | Sergeant Benton / Sgt. Benton |
| William Marlowe | Harry Mailer |
| Patrick Godfrey | Major Cosworth |
| Neil McCarthy | Barnham |
| Johnny Barrs | Fuller |
| Matthew Walters | Main Gate Prisoner |
| Bob Blaine | Prisoner |
| Michael Carter | Prisoner |
| Alan Chuntz | Mercenary |
| Les Clark | Prisoner |
| Timothy Combe | Prisoner |
| Roy Scammell | UNIT Soldier |
Producers
| Name | Role |
|---|
| Barry Letts | Producer |
