Throwaway Who Lines you wished had payoff

I really want a story about Davros and the Nightmare Child, and all those other Time War Horrors made up just to sound cool (The Could've Been King for instance - although I've heard it theorised that he might have been Zagreus).

There's also the fact that a Doctor earlier than Talons was in the 51st century during the war and I really want that story told (a 3DA maybe?)

I think there's a fifth Doctor story that deals with that

Also i like the idea of Zagreus and The Divergent Being the Could've Been King and his army of....i forget lol

In 'Talons', the Doctor casually mentions to Prof. Litefoot that he once caught a huge salmon while fishing in the river Fleet with the Venerable Bede.
Given that Bede spent his life at monasteries in Northumbria, whatever crisis had brought him (and the Doctor) to London? And were there aliens involved?

The Third Doctor was an incorrigible name-dropper, but it would be hard to top the look on the face of the Chinese delegate in 'The Mind of Evil' when the Doctor casually mentions he's a friend of Chairman Mao! There's another 20thC historical just waiting to be told.

"...of meanwhiles and never-weres", I think it ran, as well as...

"Horde of Travesties", "Skaro degredations"...

See, I'm fine with the Horde of Travesties being a mystery because it's so vague that it could be anything. Whereas Nightmare Child and Could've Been King are so evocative.

I really want to see Woman Wept. Or some dogs with no noses.

That screams the Divergents to me. Just imagine the Time Lords bringing them into the war and that's how Rassilon comes back

The Terrible Zodin and Jim the Fish.

In the "TV Movie", The Doctor knew Madame Curie... intimately.

In "Rose": "The assembled hordes of Genghis Khan couldn't get through those doors, and believe me they've tried."

The New Roman Empire was a civilisation that flourished around the year 12005.

In "The Unquiet Dead": Apparently, the Doctor pushed boxes at the Boston Tea Party and fought in World War V.

In "The Doctor Dances": The last time Jack was sentenced to death, he ordered four Hyper Vodkas and woke up in bed with both of his executioners, who stayed in touch.

In "Bad Wolf": The Ninth Doctor, while telling Lynda what happened before he, Rose and Jack were transmatted to the Gamestation, mentions that they had just "escaped" from 1336 Kyoto, where they'd gone after dropping off Egg Margaret at Raxacoricofallapatorius.

In "Rise of the Cybermen": At the beginning of the episode, the Doctor and Rose are reminiscing about some incident on an asteroid bazaar involving a fire-breathing alien woman.

In "Love & Monsters": Ursula's blog has a picture of the Doctor taken at Trafalgar Square after the events of "The Christmas Invasion". We don't know exactly what he was doing there.

In "The Lazarus Experiment": The Doctor comments that whenever he wears his tuxedo, something bad always happens. The only previous time the Tenth Doctor had ever been seen wearing a tux onscreen was in "Rise of the Cybermen"/"The Age of Steel" — and although something bad did happen then, one incident doesn't seem like enough to develop an opinion like that. The Doctor says he's seen something like Lazarus' tech before. His wording strongly implies that what Lazarus did isn't that far off from regeneration.

In "Voyage of the Damned": The Doctor claims that on the very first Christmas, he got the last room at the inn.

"Ooh, picnic at Asgard. Have we done Asgard yet?"

In "The End of Time": Why is the TARDIS depicted in one of the stained glass windows of the church at the beginning?

In "The Time of Angels": The Doctor's demeanour for the first part of the episode strongly suggests that he's had several offscreen run-ins with Doctor/Professor River Song since her previous appearance, and that the most recent one from his perspective may have ended somewhat disastrously.

In The Vampires of Venice", this gem:
*The Doctor: That's okay, 1580. Casanova doesn't get born for 145 years. Don't want to run into him. I owe him a chicken.
*Rory: You owe Casanova a chicken?
*The Doctor: [briskly] Long story, we had a bet.

Between "Cold Blood" and "The Pandorica Opens": Apparently the Doctor took Amy Pond to the Hanging Gardens of Babylon and Space Florida and its "automatic sand".

*An Egyptian goddess? Loose on the Orient Express... in space? Don't worry about a thing, Your Majesty. We're on our way! (A future audio/novel prequel?)

In A Christmas Carol": The Doctor accidentally got engaged to Marilyn Monroe in 1952. Also, there is apparently a moon made of honey. Except it's not actual honey, nor is it a moon. It's also technically alive and a bit carnivorous.

In "The Doctor's Wife": The first scene on the TARDIS involves the Doctor finishing recounting a previous adventure: "And then it turned out it wasn't the robot king after all. Fortunately I was able to reattach the head." The only thing we know about this one is that Rory wasn't travelling with them at the time.

In "The Almost People": The Doctor once plugged his brain into an entire planet to halt it in its orbit to win a bet.

In "A Good Man Goes to War": Madame Vastra makes her entrance having just killed and eaten Jack the Ripper. Whatever incident caused Strax to be made a Combat Medic to restore the honour of his clone batch. Whatever the Doctor did/will do at the Gamma Forest was so awesome that it caused the people there to see his name as meaning "Great Warrior" (A War Doctor story?). When Rory arrives at Stormcage to fetch River, she tells him that she's just returned from a birthday outing with the Doctor, which involved Stevie Wonder playing at a frost fair in 1814, London, "But you must never tell him."

In "The Wedding of River Song": Just how many stag parties did Jack Harkness have?

Pond Life": "April": The Doctor leaves a message on Amy and Rory's answering machine about escaping from Sontarans by surfing on lava, meeting Mata Hari and recording a rap album.

In "Dinosaurs on a Spaceship": The last time the Doctor saw John Riddell, he left him with two very disappointed dancers after saying he was popping out for liquorice. Riddell also says that the Doctor isn't talking him into something "again".

In "A Town Called Mercy", this gem: Ooh! You know all the monkeys and dogs they sent into space in the '50s and '60s? You will never guess what happened to them.

In "The Rings of Akhaten": The first Doctor previously visited Akhaten with his granddaughter.

In "The Name of the Doctor": The Eighth and Second Doctors appear to have been in the same place at the same time once (a beach on Earth), although it's unknown whether it was the same adventure or not.

In The Day of the Doctor: Clara's apparently been to the Black Archive before, but had her memory wiped.

In "The Time of the Doctor": We don't know when, exactly, the Doctor acquired Handles. The Doctor's past with Tasha Lem is a complete mystery; the only thing we know is that the last time he saw her was sometime before "The End of Time", because she makes it clear she's never met Eleven before.

In "Deep Breath": Vastra's reaction upon seeing the Twelfth Doctor for the first time implies that Eleven wasn't the first incarnation of the Doctor she's met. Vastra tells Clara that the Doctor "really knows how to put a band together." Said band apparently included Roman emperor Marcus Aurelius on the bass guitar.

In "The Caretaker": The Doctor said that he once spent a month living/sulking with otters because of a fight with River. The nature of the fight and where it takes place during the Doctor's timeline is a mystery, other than the fact that it was when he was Eleven.

In "Kill the Moon": The Doctor mentions he once took Clara out for dinner in 1938 Berlin.

Clara's met Jane Austen, and apparently she's a "phenomenal kisser".

The Cloister Wars.

In The Witch's Familiar", Missy of course: "I've just had a very clever idea..."

Clara: So the androids think he's dead, and the Doctor escapes?
Missy: No, he's the Doctor. He fell into a nest of vampire monkeys. But that's another story!

"Under the Lake": Clara lost her sunglasses and most of her dignity on a planet where it's perpetually New Year's Eve. Clara once got into an argument with Gandhi.

The Minister of War.

In The Girl Who Died": Apparently Clara once wielded a sword in battle. Even the Doctor was surprised to learn this.

In "The Husbands of River Song": River has apparently borrowed the TARDIS without the Doctor's knowledge on many previous occasions. Among the people who have previously been married to either the Doctor or River include Cleopatra and Stephen Fry.

In "The Return of Doctor Mysterio": At one point, Nardole materializes the TARDIS around the Doctor. Thing is, it took him a few tries, and on one of those tries he wound up emperor of Constantinople in the twelfth century, where he "ruled firmly, but wisely".

In "The Eaters of Light": The Doctor has previously spent time in Roman Britain as a governor, farmer, juggler and vestal virgin (second class). For some reason it's the "second class" bit that Nardole has a problem with, but all the Doctor says is "It's a long story."

How did Missy get control of the Cybermen? Not a throwaway line but more of a story that I'd like to see told.