Series 7, Episode 8: 'Cold War'
"Teach them, Grand Marshal. Show them another way. Show them there is honour in mercy. Is this how you want history to remember you? Grand Marshal Skaldak, Destroyer of Earth. Because that's what you'll be if you send those missiles. Not a soldier, a murderer. Five billion lives extinguished. No chance for goodbyes. A world snuffed out like a candle flame." An Ice Warrior is stirring on-board a Russian submarine. The Doctor and Clara track the creature, as it wrecks havoc on the ship, before its people come to save it.
Series 7, Episode 9: 'Hide'
"Because I killed, and I caused to have killed. I sent young men and women to their deaths, but here I am, still alive and it does tend to haunt you. Living, after so much of the other thing. You see, I was alone and unmarried and I didn't mind dying. I mean, not for that cause. It was a very, very fine cause, defeating the enemy.""And if you could contact them, what would you say?"Well, I'd very much like to thank them." Clara and the Doctor investigate a ghost in the 1970s, which turns out to be a time-traveller from the distant future. Hila is trapped in a pocket universe, and the Doctor must save her from the Crooked Man that's chasing her.
Series 7, Episode 10: 'Journey to the Centre of the TARDIS'
"I look at you every single day and I don't understand a thing about you. Why do I keep running into you? I met you in the Dalek Asylum. There was a girl in a shipwreck and she died saving my life, and she was you. Victorian London. There was a governess who was really a barmaid, and we fought the Great Intelligence together. She died and it was my fault, and she was you. What are you, eh? Are you a trick, a trap?" The TARDIS is captured by a salvage team, with Clara left inside. The Doctor and these new enemies must rescue Clara and avoid almost certain death inside the infinite ship.
Series 7, Episode 11: 'The Crimson Horror'
"Horse, you have failed in your mission. We are lost, with no sign of Sweetville. Do you have any final words before your summary execution? The usual story. Fourth one this week, and I'm not even hungry." Jenny, Strax and Vastra investigate the evil Mrs Gillyflower, who is preserving people for the coming apocalypse. There they find the Doctor, and the familiar Clara, who together stop Mrs Gillyflower and save the world.