The Thing from the Sea (audio story)

 was an exclusive-to-audio story from BBC Audio featuring the Fourth Doctor. It was read by Susan Jameson.

Publisher's summary
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!

Plot
to be added

Characters

 * Fourth Doctor
 * Fenella Wibbsey

Worldbuilding
to be added

Continuity

 * Wibbsey recalls the Hornets taking over her mind. (AUDIO: Hive of Horror)