Having had a vison of the President of the Time Lords being assassinated, the Doctor returns to his home planet to prevent it from happening.  Instead, he ends up framed for the crime.  The Doctor insists that he is innocent and then announces that he will be a candidate for the presidency.  Under Time Lord law, a candidate for president cannot be prosecuted for any crimes in the run up to the election.

The Doctor’s investigation leads him into the Matrix, a virtual reality world that is the collection of all the Time Lords’s consciousnesses.  He discovers that the assassination was actually masterminded by The Master (Peter Pratt, replacing the late Roger Delgado).    Having used up all of his previous regenerations, The Master is now a decaying skeletal figure who can barely speaks and wears a black hood.  12 lifetimes of evil appear to have caught up with him.  The Master’s plan is steal the black hole nucleus that was captured by the first Time Lod, Rassilon (sorry, Omega!), and use it to give himself a new set of generations.  Doing so will also destroy Gallifrey.

This was an important serial for many reasons.  It was the first serial to feature The Doctor on his own, with no other companions.  Having a companion usually gave the Doctor a chance to explain things that might seem strange or alien to the audience at home.  For The Deadly Assassin, we learn that Gallifrey has a BBC-like television service that provides coverage of political events and helpfully explains what is happening even though the audience of Time Lords would presumably already know.  The Doctor also spends a good deal of time talking to himself.  Normally, that could have been awkward but Tom Baker was a great talker and very good at handling solo conversations.  This serial also fully introduced us to Time Lord politics and featured the first appearance of the Doctor’s former teacher, Borusa (Angus MacKay).  Finally, and most importantly, it featured the return of the show’s greatest villain, The Master.  The Master hadn’t been seen since Roger Delgado’s tragic death in 1973.

The Deadly Assassin was one of the more violent of the Doctor Who stories.  The President was assassinated.  Time Lord anchorman Runcible (Hugh Walters) ended up with a dagger in his back.  The Master’s ally, Chancellor Goth (Bernard Horsfall), attempted to drown the Doctor in The Matrix.  After receiving outraged letters from parents, the BBC actually edited out the scene of Goth holding the Doctor’s head underwater from rebroadcasts.  The Deadly Assassin was also one of the scarier serials of the classic era.  The Master was truly a frightening figure with his raspy voice and his burned-out, skeletal appearance.

I’ve always liked The Deadly Assassin.  It features a genuinely interesting story and Tom Baker gives one of his best performances.  (Baker had specifically asked to do one serial without a companion.)  The serial’s cynical view of politics almost made it ahead of its time.  The Deadly Assassin ends with The Doctor being told that he’s won the election and that he is now President of the Time Lords.  He’s also told that it’s far too early for him to even think of resigning.  Of course, the Doctor makes a run for his TARDIS.