7. Fifth Doctor - Four To Doomsday (1982)
As Tom Baker's era ended, the new Doctor was ushered in: Peter Davison - young, athletic, and already popular, it seemed it would be a new golden age for Doctor Who. Instead, ratings began plummeting and critical opinion was harsh. Why? How could such a good leading man playing the Doctor lead to such bad circumstances? I blame this story, Four To Doomsday. Only the second full serial Davison appeared in as the Fifth Doctor, it featured the least accurate science in the history of the show. Bear in mind, this is a show about a two-hearted regenerating alien who travels space and time in a blue box that's bigger on the inside than the outside, but even by comparison, this episode has dreadful scientific accuracy. It was also made at the time when there were a total of three companions, all new. Since they were all so new, the writers clearly had a hard time working them into the story. Thus, one is almost completely ignored, another spends all her time whining, and the other becomes something of an antagonist, instead of being, you know, a companion. The story is simple enough: the TARDIS lands inside an alien spacecraft heading for Earth. The inhabitants of the ship claim they're going to Earth to share knowledge and help humans out, but it's soon revealed they have a much more sinister motive. What follows is four dreadful episodes of laughable scenes, stiff acting, dreadful rubber alien suits, plain boredom.
If You'd Like a Good Peter Davison Story: Two of his stand out above the others. Earthshock, the second greatest Cybermen episode, and probably the most emotional; and The Caves of Androzani, the Fifth Doctor's swan song. It was penned by the great Robert Holmes and features turf wars, corrupt businessmen, monsters, and an excellent homage to Phantom of the Opera.