David Tennant in Harry Potter 

Dumbledore: who are you really? David: I'm the doctor Dumbed ore: stand back Harry he's a time lord

"Send him back to Azkaban" "I... I don't want to go."

At 0:59, Snape then looks over to Harry, who then proceeds to give him the "You owe me an apology for accusing me of stealing your pollyjuice potion" look. Am I the only one who noticed that?

I'm very fascinated with his performance in this movie, because he's sticking out his tongue all the time. The worst is... *I like it*

I think David really likes playing madmen who own boxes that are bigger on the inside

I love when Snape puts his wand into BCJr's cheek like, "If you dare follow them, I will stab this wand through your flesh you little bitch."

WHY IS HE SUCH A GOOD ACTOR? And probably more important... why is he so hot?

This just made Harry Potter a billion times better...

The box is bigger on the inside

Moody just regenerated.

I can't stop grinning. I just love David Tennant

"You know what this means don't you? The Daleks are about to attack, Voldemort is returning, and the prom is tomorrow."

After all these years...... Of watching Harry Potter........ And Doctor Who....... And never realizing

"If that's not Moody, then who is he?" "I think.... I think it's the doctor."

I can't help but say that despite being under a new name, David tennant's character is the doctor

David Tennant: The Doctor, Wizard, and a lot more things... But what's most important to me: The Guy Who Got Poked In The Face By Snape xD

Well, at least he finally fixed the chameleon circuit.

Dumbledore: "Are you Allistor Moody?" Crouch Jr.: "No. I'm the Doctor." Dumbledore: "Doctor Who?" Neeeeoooow Dun DunDun Dun DunDun Dun Dun DunDun Dun DunDun Dun DunDun Dun DunDun Doweeeoooooooo Doooooo Doooooo (Doctor Who Theme)

David Tennant is in Harry Potter................................... ......My life has been rewritten.................

-Who are you really? -... -OH CRAP,ITS A TIME LORD,BACK UP HARRY

What's better than being a wizard? Being a wizard and a Time Lord! :D

Barty's box is bigger from the inside than from the outside

When he acts like this, I realize... David would have also made a brilliant Master.

Don't worry, It's just The Doctor undercover like Snape, and he's Veeeeery good at it! Even fooled Dumbledore. XD

Harry Potter, Edward Cullen and the Tenth Doctor all in the same movie.

Awful things happen to wizards that mess with time. You might understand it

I think Mad eye Moody regenerated into the doctor

"I'll show you mine if you show me yours"... That's what she said xD

"i'll show you mine if you show me yours" lol that's what she said, of course he got that line omg

I started watch doctor who about three weeks or so ago....My brother started about a year before me....I am surprised he never noticed that.... TONIGHT! WE WATCH HARRY POTTER AND THE GOBLET OF FIRE!!! Lol. Wow....David Tennant in Harry Potter....I just can't get over that!! :P

LOL at 0:57 Snape's like sorry bro I blamed you this whole time

I remember seeing this movie then 3 months later I started watching Doctor Who so when I found out that David was in this movie I was just like 'What? I have to see this!' And here I am

Holy crap, can we get David Tennant in more villain roles?

'I'll be welcomed back like a hero!' 50th Anniversary of Doctor Who, anyone?

And, of course, they give the dirtiest line in all the Harry Potter movies to David Ten-Inch

I just realized that David Tennant was in Harry Potter *brain explosion*

Though I saw him first in Harry Potter, David Tennant will always be the Doctor for me :D

As much as a brilliant performance David Tennant gave us in this, I just can't help but notice how DIFFERENT he is between the book and the movie!

dumbledore: who are you really? barty crouch jr: I'm the doctor, I'm a timelord from the planet gallifrey in the constellation of kasterborous, I'm a 903 years old, and i'm the man who's gonna save your lives and all 6 billion people on the planet below. you got a problem with that? dumbledore: ...

What the heck, that was like a regeneration.

Yeah... the "It's bigger on the Inside" was made on purpose, don't need to all shout that....

The doctor thought he would go and join voldemort this time, just for the fun! xD

New regeneration of timelord

Voldemort will have an army of Daleks

did Dumbledore just disarm that door?

I watched this movie before I started liking Doctor Who. Months later I came back to rewatch it. It was the weirdest thing ever.

he's such an amazing actor

Someone can't keep his tongue inside his mouth.

I love his voice and can do nothing about it. David, you are a great actor.

The Doctor: "I just wanted to say... Voldemort is actually an alien. Didn't you see his... nose? He hasn't got any. He's probably a mutation of a dog from Barcelona - not the country Barcelona, the planet Barcelona." Everyone: "What...?"

Am I the only one who thought of David Tennant saying something like "Hello Dumbledore!" or "Hello Harry!" in the same crazy/evil way he said "Hello, father!" earlier in this film? :D

see that? a timelord tech

"i'll show you mine if you show me yours"

"Now we know who's been stealing from your stores Severus" at 0:58 when Snape looks at Harry like damnit I can't catch this little shit doing anything wrong. XD LOL

Fantastic and underrated performance by David Tennant. One thing I'm not sure about - if Moody was really Barty Crouch Jr the entire time, what potion did he use to change to Moody's voice? Harry, Ron and Hermione's didn't change when they were in Department of Mysteries nor when Harry and Ron were Crabbe and Goyle.

0:58 when Dumbledore says “now we know who’s been stealing from your potion stores Severus.” Snape is like “ Dang it it wasn’t that little brat Potter” Then Harry’s like “ Told you so you git.”

Never had time for heros? Dont worry! He's the doctor! :D

All these doctor who references are killing me XD

That tongue-flick is just giving me all kinds of ideas....(grins devilishly)

The box is bigger on the inside.

1:28 "new teeth that's weird. so where was I? ah that's right Bosalona!"

1:37 Dumbledore: holy shit it's a time lord back up harry

He regenerated into a Time Lord!!. I wonder how Many people did a fan fiction about that..

Well Doctor, what have we learned today? That's right, cocaine is a hell of a drug.

That moment when Mad Eye Moody regenerates into the Doctor ;33

I remember watching HP and spending the entire time cheering for Tennant.

The chest was, *Puts on sunglasses* Bigger on the inside. YEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAHHHHHHHHHHHHH!

"I'll show you mine if you show me yours" .... Doctor...that's no way to talk to someone hundreds of years younger than you

David Tennant: the most adorable Death Eater and villain ever!

Holy crap I never realized it was Tennant until recently! I feel so ashamed yet enlightened at the same time.

That's no poly juice potion, that's the Doctor regenerating!

1:32 (Harry's thoughts) Witchcraft!! (Tennant's thoughts) TIMELORD

SO THAT IS WHERE THE DOCTOR WENT!

Whovians and potterheads, let your powers combine!!

“I’ll show you mine if you show me yours.” Gayest thing I’ve heard in a long time and I love it.🔥😁🔥

I think i have to rewatch the movie

David Tennant, Alan Rickman all in one scene. Cue the fangasm.

i know this is supposed to be serious or...Sirius. (he he...me bad puns) but can we just look over the fact that when Snape stuck his wand in the guys cheek. he went to like half lick it. XD

I NEVER NOTICED THAT!!! (Good part for da- I mean the doctor)

He regenerated!

1:37 hmm... new teeth...

omg i never realized it ahhhhhhhhh iv gotta watch this movie again

Kilgrave? what are you doing here?

I would die if he would say: "Hello! I'm The Doctor." :D

The look Harry gives Snape at 0:56 is my favourite thing.

Barty Crouch Jr. tries to lick Snape's wand. Snape: If you ever try to lick my wand. Screw prison. I'll drop you right now bitch. Barty Crouch Jr. : I can't help it. Snape: That's really disgusting. Barty Crouch Jr.: I know.

i think my mind just exploded

"He may be the dark lord, but I'm a time lord, the last of the time lords. I ended the war between Gallopfrey and Skaro, killing Timelords and Daleks alike. And now I'm here, on earth defending the human race, and nothing will stop me!"

HE HAS THE CUTEST VOICE EVER KSNDF,AMND DAT

if i will ever watch any of the Harry potter films it will definitely be this one :3

"Its bigger than it looks" OH MY GOSH. TARDIS REGENERATED!!!!! And that is how they regenerated back in the day…

I wished The doctor would crossover to Harry Potter, now that I found out about this scene, my wish has come true.

awful things happen to wizards who mess with time. The Tenth Doctor got the Dementor's Kiss

I absolutely love Michael Gambon performance in this scene. In the book, it is stated that at that moment, Dumbledore is no longer the nicest calm and reassuring mentor but probably the most scarier wizard that Harry never saw. Michael Gambon absolutely nailed it, his louder voice and the way he hold his wand like a knife

"Do you know who I am? Are you Alistair Moody? ARE YOU? Is he in this room? IS HE IN THIS ROOM?" Dumbledore asked calmly. "HARRY, AWAY FROM THERE!" Dumbledore said calmly.

He's such an amazing actor!!!

at 1:31 Harry: "Doctor?" Crouch Jr.: *Tries to attack him* "Graah!" Harry: "Okay, I'll get an autograph later..."

"Watch out Harry its a time lord"

This is how I first saw David tenant before doctor who... Harry Potter keeps being fantastic

Is this the ninth doctors regeneration?