The last serial in Season Two of "Doctor Who" is "The Time Meddler", and for the first time, the historical stories mix with the science-fiction stories as the TARDIS crew uncover a Monk's twisted plot to alter the course of history.
The TARDIS lands in 1066 in England where interesting and out-of-time objects are found: a wristwatch, a cannon, and a gramophone. Soon, the Doctor finds out about the Monk, who is an alien who has great pleasure in altering history. Great classic Doctor Who mayhem ensures, as all the characters go off in different directions, and the supporting characters offer great support to the regulars.
The plot is one of this serial's many strong points. It's coherent, brilliant, and perfectly paced, ensuring that you are always on the edge of your seat, wondering what's going to happen next. The visuals are strong too, with the gloomy monastery, the Saxon village, and the striking images of the Viking fleet arriving on the coast. All of the characters have depth, and they all seem real. You hate the Vikings, are enthralled by the Saxons, and the meddling Monk you find intriguing.
The 'wow' moment in "The Time Meddler" is when you discover that the Monk is also in possession of a TARDIS and it's in the last episode that you find out that he's from the same planet as our beloved Doctor. This makes for some great character clashes and witty dialogue between the Monk and the Doctor, and this forms the basis of an exciting conclusion, as the Doctor imprisons the Monk in 1066 after a lighthearted letter of apology.
The final moments of the story give a sense of wonder as the TARDIS dematerialized and we are left at the end of Season Two with a shot of outer space. I think it makes you wonder what other adventures face our new TARDIS crew in the months until Season Three airs.