The TARDIS lands awkwardly on the edge of a vast swamp on the planet Sunday.

Full credit to her for managing to make the Doctor sound so convincing.

Its fair to say Freemas acting skills lift an otherwise quite pedestrian story of survival.

Agyemans clearly enjoying herself especially when vocalising the otters.

Russell T Davies feels that alien planets should fundamentally convince the viewer.

The beauty of audio is, of course, the pictures are always better.

Freema paints a convincing alien world, in turn peopled by a realistic spread of characters.

At nearly two and a half hours duration the story is on an epic scale.

Being the equivalent length of a classic series six-parter, at times it feels over-long.