Excelis Decays
Excelis Decays is a Big Finish Productions audio drama based on the long-running British science fiction television series "Doctor Who". It is the final part of the Excelis trilogy which commenced in "Excelis Dawns" and continued in "Excelis Rising". The events are also connected to the Bernice Summerfield audio drama "The Plague Herds of Excelis". Plot. The Seventh Doctor again visits Artaris and is finally able to resolve the mystery that two of his incarnations have encountered.