Plots(1)
The Zero Room is gone, and the Doctor's regeneration is unstable. To help him, Tegan locates the tranquil world of Castrovalva and the TARDIS heads there. (Prime Video)
Cast
![Peter Davison](http://image.pmgstatic.com/cache/resized/w88h116crop/files/images/creator/photos/042/871/42871893_b63544.jpg)
Peter Davison
UK
Best series:
Sherlock (2010) (series)
All Creatures Great and Small (1978) (series)
Miranda (2009) (series)
Janet Fielding
Australia
Best series:
Doctor Who (1963) (series)
Doctor Who (2005) (series)
Hammer House of Horror (1980) (series)