0:00:02 > 0:00:04Hello, everyone. Guess who?
0:00:13 > 0:00:16In this week's Confidential, Amy explores her maternal side...
0:00:16 > 0:00:18Can you see the resemblance?
0:00:18 > 0:00:21In this episode, Amy becomes a mum.
0:00:21 > 0:00:25Kissing and crying. I'll be back in a bit.
0:00:25 > 0:00:28I think Rory unexpectedly becoming a dad will change him completely.
0:00:28 > 0:00:34..and there's an end to keeping mum when a massive secret is revealed.
0:00:34 > 0:00:35I'm your daughter.
0:00:38 > 0:00:40Yes! I get to be Alex Kingston's mum.
0:00:40 > 0:00:42Spoilers! You're not allowed to hear!
0:00:42 > 0:00:46I just couldn't quite believe it. I just thought, "That's fantastic."
0:01:00 > 0:01:02Welcome to Confidential.
0:01:02 > 0:01:06Join us behind the scenes as we finally close the door
0:01:06 > 0:01:08on the rumours of River Song.
0:02:01 > 0:02:05In the dead of night, in a hangar near Cardiff,
0:02:05 > 0:02:08the Doctor has rallied an army of aliens
0:02:08 > 0:02:12and called on his friends to fight the mother of all battles.
0:02:12 > 0:02:15It felt like... I think this is a boys' thing,
0:02:15 > 0:02:20but it felt like you had every action figure
0:02:20 > 0:02:24from all your favourite TV shows and from all your favourite cartoons
0:02:24 > 0:02:27all in one gang. It's like a kind of dream team.
0:02:27 > 0:02:29The child.
0:02:29 > 0:02:32At all costs, we protect the child!
0:02:32 > 0:02:35Last time I did this I just had a wig on.
0:02:35 > 0:02:37- Now I've got swords as well! - SHE LAUGHS
0:02:37 > 0:02:39Excellent.
0:02:53 > 0:02:57I was a bit nervous before, but we had a stunt guy on set to help us
0:02:57 > 0:03:00and we were killing these monks,
0:03:00 > 0:03:04who were also stuntmen, so you were quite free to do what you wanted.
0:03:04 > 0:03:05Straight in there, yeah?
0:03:05 > 0:03:08'The first thing I do, I'd speak to the director
0:03:08 > 0:03:11'and find out exactly what he wants to see, and in this case,'
0:03:11 > 0:03:14it's just a shot of the two of them taking out all the monks
0:03:14 > 0:03:19very quickly, very slick, so I had to choreograph it with two swords,
0:03:19 > 0:03:21'which makes it a bit more complicated for Neve,'
0:03:21 > 0:03:25but she picked it up really well and both of them are fantastic.
0:03:31 > 0:03:36Eagle-eyed viewers may notice the Oval Office set.
0:03:36 > 0:03:39Now a birthing chamber where Amy has swapped her bump for a baby.
0:03:40 > 0:03:45They're being held captive by baddies wanting to bait and bring down the Doctor.
0:03:59 > 0:04:04And there's a new addition to the Doctor Who family, who already knows her lines.
0:04:04 > 0:04:06BABY CRIES
0:04:07 > 0:04:11I tell you what. Karen, what about if all you see...
0:04:11 > 0:04:15if Karen was holding Harrison now, then on action, went forward and then brought him back?
0:04:15 > 0:04:17Oh, my God!
0:04:18 > 0:04:22Never mind arch villains, this is proper scary.
0:04:22 > 0:04:25In this episode, Amy becomes a mum.
0:04:25 > 0:04:29I know that we've seen her pregnant before, but that was in a dream.
0:04:29 > 0:04:32Whenever you're ready, Amy.
0:04:32 > 0:04:33Oh!
0:04:33 > 0:04:35THEY CHEER
0:04:35 > 0:04:37- You've swallowed a planet! - I'm pregnant.
0:04:37 > 0:04:39You're huge!
0:04:39 > 0:04:45This is definitely for real and it's really interesting because I'm a bit nervous around the babies.
0:04:45 > 0:04:47'We've had real babies.'
0:04:47 > 0:04:49Awww!
0:04:51 > 0:04:53And that's it?
0:04:53 > 0:04:54That's it.
0:04:55 > 0:04:59We had two babies who were twins, Madison and Harrison.
0:04:59 > 0:05:01- Who've we got this time? - Madison.
0:05:01 > 0:05:02Madison!
0:05:02 > 0:05:06Acting with babies, and filming with babies,
0:05:06 > 0:05:11it's quite challenging at times because they cry when they want to.
0:05:12 > 0:05:15BABY CRIES
0:05:17 > 0:05:19I wish I could tell you that you'll be loved.
0:05:19 > 0:05:21BABY CONTINUES TO CRY
0:05:21 > 0:05:25That you'll be safe and cared for and protected.
0:05:25 > 0:05:29There was a lot of just going with that and going with whatever the baby does
0:05:29 > 0:05:32and hopefully that just made it more natural. We'll see.
0:05:35 > 0:05:38Tension on set is mounting.
0:05:38 > 0:05:43The crew are filming the key scene, which is being kept under the tightest of wraps.
0:05:43 > 0:05:47It's the cliff-hanger we've been building the whole series towards,
0:05:47 > 0:05:49and we're trusting you guys to keep it quiet.
0:05:49 > 0:05:53So please, please, don't let it get out of the building. Thank you.
0:05:59 > 0:06:03It's your daughter's name in the language of the forest.
0:06:03 > 0:06:05I know my daughter's name!
0:06:05 > 0:06:07Except they don't have a word for "pond",
0:06:07 > 0:06:10because the only water in the forest is the river.
0:06:10 > 0:06:14'There's a piece of cloth inside the cot,'
0:06:14 > 0:06:16and that says my name,
0:06:16 > 0:06:20but on the actual cot, I think it's his name.
0:06:20 > 0:06:25It's the Doctor's cot, but is it only the Doctor's cot?
0:06:25 > 0:06:26Um...
0:06:29 > 0:06:31Yes, that's all I can say.
0:06:31 > 0:06:35How many babies have been in that cot, basically?
0:06:37 > 0:06:40The Doctor will find your daughter, and he will care for her,
0:06:40 > 0:06:42whatever it takes.
0:06:42 > 0:06:44And I know that.
0:06:54 > 0:06:56It's me.
0:06:58 > 0:06:59I'm Melody.
0:07:01 > 0:07:02I'm your daughter.
0:07:05 > 0:07:08So River Song is Amy's daughter!
0:07:08 > 0:07:12I couldn't believe that when I read that in the script,
0:07:12 > 0:07:13I really couldn't.
0:07:13 > 0:07:17I mean, it's the best, yes! I get to be Alex Kingston's mum.
0:07:17 > 0:07:21When Steven Moffat first told me the truth about River Song,
0:07:21 > 0:07:25I just thought, "You clever so-and-so.
0:07:25 > 0:07:28"You are... You're amazing."
0:07:28 > 0:07:30One of the dangers of a reveal,
0:07:30 > 0:07:33one of the dangers of whipping the cover off a secret
0:07:33 > 0:07:37is that you've just got an answer. You say, "Well, that's what it is."
0:07:37 > 0:07:39"Is it door one, two or three?" Well, it's door two.
0:07:39 > 0:07:41You have to have a reveal,
0:07:41 > 0:07:45you have to have an answer that is as complicated as the question.
0:07:45 > 0:07:49You have to actually say, "Oh, now that that's the case,
0:07:49 > 0:07:51"we're in even more trouble."
0:07:51 > 0:07:53So the answer is as good as the question,
0:07:53 > 0:07:56and it's as troubling as the question, and is not final.
0:07:56 > 0:07:59I don't actually want to end the story, that would be bad.
0:07:59 > 0:08:04It was a relief also knowing that finally I wouldn't have to hold on to that secret any more,
0:08:04 > 0:08:09'and that the others wouldn't have to try and bribe me any more either.'
0:08:09 > 0:08:13Now it's finally revealed, and she's Amy's daughter,
0:08:13 > 0:08:16Amy and Rory's little girl. So that is just the best.
0:08:16 > 0:08:20I don't think they'd dared believe
0:08:20 > 0:08:25that the reality would be that I was their daughter.
0:08:25 > 0:08:27But I am.
0:08:51 > 0:08:54Subtitles by Red Bee Media Ltd
0:08:54 > 0:08:57E-mail subtitling@bbc.co.uk