![View Poster Image](https://image.tmdb.org/t/p/w342/iBGaR6hmCo70w1fiVhQoVcK2DPY.jpg)
![](https://image.tmdb.org/t/p/w92/aqfqXEwhP5VJPgebbyJvyAW3urw.jpg)
Peter Sallis
Wallace (voice) (6 eps)
![](https://image.tmdb.org/t/p/w92/ukGtNrFyiVV21ScQvyeORWCtk5Z.jpg)
Ashley Jensen
Herself - Narrator (6 eps)
![](https://image.tmdb.org/t/p/w92/kIzMwX1R7wBbQytvcz639s1nQGZ.jpg)
John Sparkes
Goronwy (voice) (6 eps)
Jem Stansfield
Himself - Science Correspondent (6 eps)