The Destruction Of River Song

This is the fifth story from Season 18.
==Story==
The Doctor saw River Song give her life for him a long time ago but accidentally witnesses it too early which leads to a massive investigation by him and Susan to find who’s responsible. After a search, the Trickster emerges hoping to kill the Doctor for once and for all.
==Cast==
The Doctor - Adrian LesterSusan - Lydia West
==Behind The Scenes==
This episode would be written by Mark Gatiss.