9. Amy's Choice
The fifth series of NewWho was really a revelation, and this trailer stands out as one that really managed to play on the anticipation that was building up around Amy Pond and the overarching story of the cracks in the Universe. Despite ultimately having little to do with the former, the episode ended up providing us with some genuinley interesting insight into the character of Amy Pond. The trailer tells us that the story is set five years later (in some capacity), and we're teased with a pregnant Amy and a Pony-Tailed Rory before things are turned on their heads with the introduction of the Dream Lords. What really worked about this trailer is that it presents us with a genuinley intriguing setting and a direct threat to the Doctor and co.