Doctor Who, The Thing from the Sea

Susan Jameson reads a brand new original story featuring the Fourth Doctor and his companion Mrs Wibbsey.
In 18th Century coastal Italy, the local fishermen haul in an extraordinary catch: a gigantic serpent. The Doctor identifies it as an alien, but to the ailing locals this fabled sea creature has the capacity to heal them - if only Count Otto will share it with them. When Mrs Wibbsey comes under the influence of the Count, the Doctor finds himself snared by the wicked power of a seemingly immortal magician, the infamous Cagliostro!
Set after the events of the Nest Cottage Chronicles, the story is read by Mrs Wibbsey herself, as played by Susan Jameson.