Christel Doctor Who of the Week...The Master

Although the master plays quite a pivotal role in the final 2009 special Endgame he dissapears quite quickly and it is never explicitly said what happened to him.

I did intend for this to be the case and wanted to use the master in series 2 of Christel Doctor Who, but then I came up with the Rani storyline and never picked the Master thread up again.