The story's producer, director and designer discuss the problems of shooting underground caves and cave-dwelling monsters in the confines of a TV studio. Featuring Barry Letts, Timothy Combe, Barry Newbery, Terrance Dicks, Caroline John, Nicholas Courtney and Peter Miles.
| Creator | C. E. Webber |
|---|---|
| Actor | Sylvester McCoy, Sophie Aldred |
| Country | United Kingdom |
| Production | BBC |