Clara is floating in space and she is in conversation with Doctor, who is taking fire on the Tardis. The Doctor tells her that she is next on the priority list. Clara reports that there's something in her suit and the Doctor tells her that it is probably a love sprite from spending too much time in the mines. The Doctor tells Clara not to worry and that the sprite is just hungry. The Doctor asks Clara about the stars and nebulae that she can see and Clara answers but adds that she can feel the sprite on the back of her neck. The Tardis materializes around Clara and the Doctor pulls off her helmet before the sprite can asphyxiate her. The Doctor stomps on the creature and Clara questions if the aliens they were trying to save came through okay. The Doctor heads outside to wipe the sprite guts off his foot and explains that the invasion was stopped for now and that the next time, the species they were trying to help will be ready for an attack. Clara is not pleased with his answer but the Doctor explains that this was the best that he can do.
The Doctor snarks that he's not actually the police and it only says so on the box. Clara says that he is always telling her what he can and cannot do but never tells her the rules. Whoa....hold up a sec....Clara is the longest serving companion in NuWho and she has never had a conversation with the Doctor about the rules? Okay, I guess better late then never. The Doctor tells Clara that they can make ripples in time but not waves.
Their conversation is cut short when they are surrounded much to the Doctor's lament by Vikings. When the leader declares that the Doctor and Clara are coming with them, the Doctor puts on his wretched sonic sunglasses, claiming that he is wearing technology which is better than humanity will manage over the next nine million years. Giving the Doctor a lesson in shooting off his mouth, the viking simply takes the glasses off the Doctor's face and breaks them in two. Thank goodness! Good riddance to the sonic glasses and may they never ever be rebuilt. I am know I am not the only one celebrating their destruction. The Doctor turns to Clara and informs her that they are going with the vikings.
The Doctor and Clara are taken to a viking settlement where Ashildr happily awaits the return of the warriors. It seems that Ashildr had a dream that they had all died. Clara tells the Doctor that he can do something anytime soon and the two bicker about whether or not the Doctor has a plan. The Doctor stares at Ashildr when they go by, causing Clara to question if he knows her. The Doctor answers that he has never seen Ashildr before and that it's a case of too much time travel. The Doctor explains that premonition is simply remembering in the wrong direction.
The Doctor's big plan is to pretend to be Odin because to the primitive mind, advanced technology can seem like magic. The Doctor pulls a yo-yo out of his pocket and hits the leader in the forehead with it. The warriors pull their swords as the Doctor tells the vikings that he is very cross and disappointed with them. The Doctor then claims that the yo-yo is the sign of Odin. The vikings don't believe him, so the Doctor questions if they have met Odin and know what Odin looks like. Right on cue, Odin appears in the sky and tells the vikings that their day of reward has finally arrived. The Doctor screams that the vikings are not to believe what they are seeing. Odin tells the vikings that their mightiest warriors will feast with him in Valhalla tonight.
Big steel warriors suddenly appear on the ground and the Doctor orders Clara to stay very still. Clara questions if they are really dealing with Odin and the Doctor points out that Odin doesn't even have a yo-yo. Clara realises that what they are dealing with is an invasion. The warriors form a fighting circle as the invading forces advance. The Doctor tells Clara that what they are watching is a harvest and that the invading force will leave behind the sick, young, and old. The warriors are beamed on board, as the Doctor tells Clara that they cannot get chosen. Clara runs to Ashildr and tries to teach her how to use the remnant of the sonic sunglasses but this catches the attention of the invading force and Ashildr and Clara are beamed up as the Doctor watches. Odin then disappears from the sky. Smooth going Clara and now the Doctor will be expected to clean up her mess.
When Clara and Ashildr appear on the ship, the vikings welcome the women to Valhalla. A brave viking steps into a corridor and is instantly varpouized by an electric shock leaving behind his sword and his horn helmet. Yeah just for the record, vikings didn't have horns on their helmets. The walls begin to close in, pushing the vikings, Ashildr and Clara into the same corridor. Clara tries to get the vikings to jam the wall with their swords and when that doesn't work, Clara and Ashildr run to the other side of the corridor and try to open the doors. Despite their best efforts, the vikings are pushed into the corridor and vapourized.
On the ground the remaining vikings are astounded at the loss of the soldiers. Some think that their warriors went willingly to Valhalla. The Doctor is not impressed with their conversation and announces that not only did he lie about being Odin but so did the face that appeared in the sky because Gods don't actually show up. The Doctor tells the remaining village members that they got raided and he lost someone who matters to him.
Clara and Ashildr are the only two surviving people who were beamed aboard the ship. Ashildr questions why they are still alive and they are confronted by the false Odin holding onto half of the sonic sunglasses. Clara tells the fake Odin that she didn't mean to make him afraid. Odin is incredulous and claims that he has no reason to fear but Clara points out that he has already scanned the sonic sunglasses and knows that it is from a society vastly more advanced than his. Clara then points out her space suit and adds that it is highly unlikely she didn't come alone. Clara surmises that Odin didn't kill them because he is unwilling to start a fight that he is not sure he can win. Odin then drinks down the testosterone which was extracted from the warriors calling it nectar. Clara calls Odin a thief caught in the act and tells the alien to go and find vikings on other planets promising not to follow him. I love when she points out how annoying all of the testosterone in the galaxy is. The fake Odin claims that war is the way of his people, so Clara asks him to consider if this is a war he really wants. Ashildr however steps forward and tells the fake Odin that they will pay for what they have done today. It's clear that Ashildir has the soul of a viking as she calls for blood even as Clara tries to shush her. Odin says that they almost had them talking and then agrees to a battle against ten of the villages warriors. Odin sends Ashildr and Clara back so that she can inform her people of their impending destruction.
