Doctor Who - Part 2

7) Time of Angels and Flesh & Stone
Episodes 4 and 5, Season 5
Eleventh Doctor (Matt Smith)
Companion: Amy Pond (Karen Gilliam) and River Song (Alex Kingston)
Plot: After traveling to a museum in the future, the Doctor and Amy discover a message from River Song written on a flight recorder for a ship that crashed 12,000 years earlier. Amy and the Doctor travel back to save River before the ship crashes. The cargo of the ship is a Weeping Angel, a being that lives on energy (like electrical or human) that looks like a statue. As long as someone is looking at the statue, they can't move but anytime you look away, that Angel can move. If two Angels look at each other, they are trapped immobile forever; as a result the Angels will cover their eyes when stationary and so look like they are weeping. River Song and a team of clerics (which is more like a military unit) want to recover the weakened Angel before its proximity to the radiation of the ship will make is powerful enough to threaten the population of the planet. The is a four-second recording of the Angel that River, Amy, and the Doctor view while discussing a book written about the Angels (by an insane man) that states "That which holds the image of an angel becomes itself and angel". Amy looks away from the recording and the Angel start emerging from the recording and see is trapped in the viewing room (and she looks the Angel in the eyes). Amy is able to freeze the recording at a certain part of the loop and causes the Angel to disappear. To get to the Angel statue and the ship, the team must travel through a stone labyrinth filled with stone statues called the Maze of Death. Doctor and River discover that the stone statues are slowly turning in Weeping Angel due to massive amount of radiation coming from the crashed ship. As the Doctor, River, Amy, and the clerics race toward the ship followed by the Weeping Angel, the image of the Angel is embedded in Amy's brain so she is slowing becoming a Weeping Angel and so must keep her eyes closed to slow the transformation.
Why I love these episodes: The Weeping Angels are probably the most terrifying creature/beings that has ever been on Doctor Who. The addition of River Song is great, because she knows the Doctor in various points of her/his life and they have some sort of relationship. Being able to piece their relationship together is really fun. And this episode was written by my favorite Doctor Who writer (and current show runner) Steven Moffat. I like the special effects for the Weeping Angels because instead of using CGI (which would probably be less scary), the Weeping Angels are played by women in costumes and painted to look like stone.

8) Partners in Crime
Episode 1, Season 4
Tenth Doctor (David Tennant)
Companion: Donna Noble (Catherine Tate)
Plot: Donna and the Doctor costarred together in a previous Christmas special (after season 2, before season 3), and she declined the Doctor's offer to travel with him, a decision she later regrets. As a result, Donna becomes a little bit of a conspiracy theorist in an attempt/hope to met the Doctor again. Donna and the Doctor are separately investigating Adipose Industries that markets a diet pill with the slogan "The Fat Just Walks Away". Turns out the slogan is correct, the pills use body fat to create an alien named Adipose. The pill can be altered to use the entire body to create Adipose. Donna and the Doctor work together to make sure that doesn't happen.
Why I love this episode: Donna Noble is my favorite companion (and Amy Pond is a really close second). Unlike the two previous companions, Donna has no romantic interest in the Doctor. So this episode is just hilarious and really light-hearted which is a nice change from the dark tone of the last two episodes of season 3. And the Adipose aliens are actually really cute. Plus, the guest star was the actress who was Mrs. Hurst in the BBC adaptation of Pride and Prejudice.