Also:
3) The Daleks ("Bad Wolf"/"The Parting of the Ways", 2005)
So you're the Daleks, and you've been basically wiped out in the Time War. You need to create a new army of evil mutants encased in super-armor — but you're really, really racist. So you don't want to turn just any humanoids into Daleks, you want to find a handful of humanoid cells that are worthy of mutating into Dalek life forms. So far, so good. So of course, you take over a media satellite in the far future and create spoofs of early-2000s game shows and reality shows. Wait... what?
No, see, it makes perfect sense. The Daleks want to kidnap humans without anybody noticing, to harvest their DNA. So they create exact replicas of Big Brother and The Weakest Link, and probably Who Wants to Marry a Millionaire too. Anyone who is "eliminated" on those shows is apparently killed — but is actually teleported millions of miles away, to the Dalek ship. The Daleks have the capacity to teleport people without being detected, but they don't just kidnap people from Earth or elsewhere, because that wouldn't be nearly as cool. At a certain point, the Daleks have amassed a huge, unbeatable army of Daleks and a nearly endless fleet of warships — but they don't launch their invasion of Earth, they just keep on running game shows until the Doctor stumbles on them.
Oh, and the Daleks randomly have a cyborg lady on their media satellite, running all their stuff for them, even though she isn't loyal and betrays them the first chance she gets. They also have a huge staff of humans working for them, who have to be kept ignorant about what the games are really about.
(Side note: given that Rose destroys an entire Dalek war fleet just by waving her hand, after looking into the heart of the TARDIS for a second, you have to wonder why the Time Lords didn't try that tactic during the Time War. Or if the Time Lords did try that, why the Daleks didn't develop a defense against the "look into the TARDIS and become a god" maneuver.)