The Krafayis

The Krafayis appears in season 5 episode 10: Vincent and the Doctor.

This was an amazing episode, Amy and the Doctor go back to France, 1890 to talk to Vincent van Gogh about an alien looking creature that they saw in Vincent's famous painting, The Church at Auvers.

Actual Van Gogh : The Church at Auvers

When they got there they quickly realized that Vince was a poor, drunk man, who nobody seemed to like. Right after they meet him, a young girl is murdered, the town blames Vince. The Doctor and Amy are able to slyly convince Vincent to let them stay at his home for a few days.

During a conversation about "hearing the colors" Amy screams off in the distance. She was attacked by something invisible. Now this scene, is quite possibly my favorite,  Vincent fights off this invisible creature, that only he can see, while the Doctor claims that he is having "some sort of fit"

Krafayis in the church window

Matt, the Doctor, uses this clever little machine that gives information on whatever it sees. The machine spots the creature and gives us the following information :

•  Krafayis,
• Planet of Origin: Uncertain
• Nomadic pack animals
• Strict dominance hierarchy
• Huge Territories, several solar systems wide
• Preferred Habitat: Planets with Oxygen and Nitrogen based atmospheres 

The Doctor sees the Krafayis

The Doctor later elaborates by saying that the Krafayises travel in pacts around the universe, and when one falls behind, the pack leaves it. And that's how this one ended up in France.

The Krafayis is a vicious creature that kills as the pack travels. It almost looks like a giant chicken, with creepy eyes and the height of NBA player Yao Ming. 

The Krafayis problem ends up being solved, but I will not say any spoilers.

The Krafayis

Vince and his self portrait

Check out the trailer for this episode below \/ \/

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Saturnynes

The Saturnynes are another terrifying species that Matt Smith has to deal with. They are in the episode "The Vampires of Venice" in season 5, episode 6.

You are made to believe that the Saturnynes are vampires throughout msot of the episode. Girls as young as 17 join the House of Calvierri to gain a better place in society. Once these girls, such as Isabella, daughter of a boat builder, join the house, their family never see's them again.

Isabella and her father

Rosanna Calvierri and her son, Francesco, choose the girls that make it into the house. Signora Calvierri only lets them in if Francesco "likes" them.

Rosanna and Francesco Calvierri

The Doctor brings Amy Pond and her fiance Rory Williams to Venice as a sort of...wedding gift. Shortly after arriving the Doctor notices Isabella's father causing a scene while he tries to look for her. This causes the Doctor to investigate.

Soon enough, we find out that these girls in the school have vampire like fangs, walk around outside with their faces covered, and that they don't even have reflections in a mirror.

The Calvierri Girls

We eventually find out that the Calvierris and the girls, are a lot worse than vampires. They are in fact, amphibious arthropod aliens who drink blood. They have razor sharp teeth, legs that comes from the abdomen, which are multi jointed and end in blade like bones that can pierce their prey.

Saturnyne

Saturnyne

The Saturnynes look like humans because they use a perception filter that manipulates the brainwaves of anyone looking at them..

They are eventually defeated by the Doctor (surprise!) by disabling the elements manipulator that stops the flooding of Venice. Rosanna commits suicide because she failed to secure the future of her race. I won't say anymore because spoilers.

My sources include the episode itself, the  Doctor Who: The Complete Visual Collection book and www.tardis.wikia.com .

Prisoner Zero

The eleventh Doctor, Matt Smith, was my favorite Doctor, and that wasn't just because his bow tie was cool. Matt had some devious villains that were specific to his time as the Doctor. Prisoner Zero was Matt Smith's first encounter after his regeneration.

Matt Smith as The Doctor

Prisoner Zero is a very dangerous creature who escaped the police race the Atraxi,  using a crack in time and space. After escaping the Atraxi, Prisoner Zero hides out in a house that a young Amy Pond lives in.

Young Amy Pond with the Doctor

The creature hides on Earth using shape shifting as a disguise. The creature makes a mental connection with the people, or animals that it shapes into. Once they have a connection, the original person or animal, goes into a comma.

Along with it's shape shifting ability, it can create perception filters. Due to this, Prisoner Zero was able to create a perception filter around the room it was living in. Prisoner Zero lived in Amy's house for twelve years before the Doctor was able to sort it all out. Amy hears the Atraxi say "Prisoner Zero has escaped" over and over again as she grows up.

When Matt shows up, he points out the door that Amy had never seen before, and that's when she sees Prisoner Zero for the first time. The creature has a snake like body, with razor sharp teeth and yellow eyes.

Prisoner Zero's Natural Form

The Atraxi use sophisticated technology to search Earth for Prisoner Zero, they are able to pick up anything alien. Since the prisoner can change into humans, the Doctor tries to help the Atraxi capture the creature.

The Doctor uses Rory William's phone to create a virus that sets all clocks to 00:00. By the time the Doctor finds Prisoner Zero, the Atraxi trace Rory's phone and find Prisoner Zero in its natural form.

I chose to talk about Prisoner Zero because he truly was a scary villain, who was quite the match for the Doctor.

For more information on Prisoner Zero click here