Barty Crouch Jr. and the Doctor are in for the surprise of their lives when they are forced to live in one another's shoes. Now both men must navigate and survive the other's unfamiliar world, all the while trying to solve the mystery behind their switch.

TimeLord!Harry has managed to hold off Regeneration for now but his Regeneration is now about to happen

Ember Potter knew that she was different. If the two hearts didn't give it away, it was all the weird stuff that kept happening around her...kinda like magic. This was confirmed when she received a letter from Hogwarts on her 11th birthday. Follow the Girl Who Lived as she navigates her way through her first year. HP/DW crossover with some elements of Marvel (Fem!Harry)

Watch as the Time War takes on a whole new meaning as Harry enters it to stop the Doctors saving Gallifrey as they intended.

What if the Doctor wasn't the only Time lord to survive? What if there was another, what if a time lady survived one of the Doctors links one of his mates? However, what if she had no choice but to go through the chameleon's arch? What if she doesn't completely remember him or River Song? Well, meet Kayla Evens.

During Harry's first year at Hogwarts, a mysterious man known only as the Doctor is the new Muggle Studies professor. As Harry passes through each year at the magical school, his and the Doctor's bond grows stronger, even if the latter undergoes a myriad of changes.

Angelika Lokisdottir. Angelina Prince. Amara Lethe. She was born a princess, raised as a witch and became a Gallifreyan. A triple threat who's got nothing left to lose for she'd lost everything. Yet…there maybe be a glimmer of hope on the horizon… (DW/HP with some MCU crossover)

Voldemort attempts to attack lord peverell's castle, he fails and offers a alliance, the order of the phoenix are now in a race to win over lord peverell's allegiance and potentially the war, but it appears lord peverell isn't as he seems

When the doctor left to continue his life before he forgot something. His watch, the family that he made was forgotten. But the family never forgot him and passed down the watch to hopefully return it to him but he never came back. They eventually forgot as well but keep passing the watch on to the next generation till it came in to Harry Potter possession.

Harry gets put into another universe this time in the Doctor Who's universe, where he will be travelling with all Doctors and helping them all the only way he knows how.

A mass murderer escapee from Azkaban, Sirius Black, is said to be after Claire and Harry. Join the Golden Quartet as they uncover the truth behind Sirius Black as well as Claire's parents' heritage.

Claire finds a mysterious diary that talks back to her. At first she's hesitant, but as she writes the diary eases her worries. She soon realizes the consequences of confiding in inanimate talking objects and discovers the monster within her is the same one which dwells in the Chamber of Secrets.

Follow Claire Smith (daughter of the Timelord the Doctor and Sirius Black's twin sister Carina Black) to her first year at Hogwarts and becomes a member of the Golden Quartet. She unravels the mystery of her parents disappearance and why she's at the top of Voldemort's hit list along with her best friend Harry Potter. Along the way, Claire discovers some things aren't to be easy.

Bad things happen when you trust the wrong people. Strange things have occurred since the Golden Quartet started their fourth year at Hogwarts. Claire's dreams have revealed there's an insider working for Voldemort at Hogwarts. They know these strange incidents are connected to Voldemort's spy. It's up to them to figure out the imposter's identity before Voldemort rises to power.

A series of seven books where 11 ended up in in a different dimension. He becomes the new astronomy teacher and goes with Harry on his adventures (actually he just follows them without their permission finding his own genius way around obstacle) This book is the scorcerer's stone. Enjoy.

Why do wizards not want the goblins to have wands? Because once they do, they follow the Sontaran guide to planet enslavement, and the general Sontar soldier was... dense and deadly and had wands capable of being used by anybody. A drabble one shot that has Bill Weasley look at extra terrestrial trash.

A British Army Officer joins forces with inhabitants of the wizarding world. This is the first story in the Repliverse Saga

Read as Harry works out the power it takes and what must be done for him to grow his own TARDIS

Watch as Harry Potter continues to travel in the Doctor Who universe and changes things as he stays with the Doctor and the Master

Out in the Universe is a bright blue box, holder of a fantastical realm. Inhabiting this box is a mad man who calls himself the Doctor, his son, the Savior of the Wizarding World aka Harry Potter, an immortal man from the 51st century who affects a Captain in front of his name, Jack Harkness, and a pink and yellow once-human who is simply Rose Tyler. What was Dumbledore thinking?

Read about Harry Potter traveling to the Doctor Who universe and changing things as he joins the Doctor and the Master

Watch as Harry Potter travels to the Doctor Who universe and changes things as he joins the Doctor and the Master

'Our lives are but specks of dust falling through the fingers of time. Like sands of the hourglass, so are the days of our lives.' – Socrates.

'Wibbly Wobbly' is the time. 'Abracadabra' is the word. Join them together and you get a universe that's quite absurd. Lose a toolbox; or at least a spanner or two. And then throw in a plot and give it a few good twists. A tale you'll have then created; one, however, that may need a few good anthologists... (M for Mature Themes.)

All of Albus Dumbledore's plans and strategies for the prophecy, everything Lord Voldemort planned and plotted for the death of Harry Potter…all of them will be thrown out of the window. The Doctor, fresh from the Time War, has been on Earth, regenerated into a baby form, just wants to be left alone and recover his regenerating TARDIS, not fight another war.