0:00:16 > 0:00:18DOG BARKS IN DISTANCE
0:00:18 > 0:00:20'We may be able to get the information we need.'
0:00:20 > 0:00:21CAMERA CLICKS
0:00:21 > 0:00:24Just a few more hours, we are doing well.
0:00:26 > 0:00:28HE DROPS CAMERA
0:00:28 > 0:00:30(Did they hear me?)
0:00:30 > 0:00:32Probably, dude, but I'm not waiting to find out!
0:00:36 > 0:00:38I tell you, I heard something.
0:00:38 > 0:00:40ELECTRONIC SOUND
0:00:50 > 0:00:53ELECTRONIC BEEPING
0:00:54 > 0:00:56THEY GASP BREATHLESSLY
0:00:56 > 0:00:58- BOTH: Argh! - Oh, chill! It's only us.
0:00:58 > 0:01:00- Did you see them?- See who? - BOTH: N.O.Body!
0:01:00 > 0:01:03Wha... No. Guys, look!
0:01:03 > 0:01:05- Same worlds meet! - Is that what's happening?
0:01:05 > 0:01:08I mean, well, we translated this from the cave, but...
0:01:08 > 0:01:10Just lock yourselves in tonight, they're coming!
0:01:10 > 0:01:12SLIM GASPS
0:01:12 > 0:01:15- Are they always this weird? - Ahem, yep!
0:01:15 > 0:01:18Come on, Gregor. It's time to go, love.
0:01:18 > 0:01:20- See you, Luke.- Later, Gregor.
0:01:25 > 0:01:27Help! Let me out!
0:01:27 > 0:01:29Why did you wait so long?
0:01:29 > 0:01:32You should have called me the moment she became agitated. Gaia?
0:01:32 > 0:01:36Mr Morelle, it's me! Let me out, please! There's been a mistake.
0:01:36 > 0:01:40Please! Open the door!
0:01:40 > 0:01:41Open the door!
0:01:41 > 0:01:43I need you to calm down for me first, Gaia.
0:01:54 > 0:01:57< GASPING
0:01:57 > 0:02:01- What time do you call this? - Er, 9.25?- No.- 21.25?
0:02:01 > 0:02:04Past curfew time!
0:02:04 > 0:02:07You two learned nothing after your little escapade today?
0:02:07 > 0:02:10Consider yourselves confined to quarters for the next 24 hours.
0:02:10 > 0:02:13- Great! Thank you, Dad!- How about making it 48?
0:02:13 > 0:02:15KNOCKING ON DOOR BOTH: Gaaah!
0:02:19 > 0:02:23- Is it OK to speak to Slim and AJ? - No, it's most certainly not OK.
0:02:23 > 0:02:27All teenagers back to their quarters by 9pm prompt. Now go!!
0:02:32 > 0:02:34She'll sleep now till morning.
0:02:34 > 0:02:36Keep a close eye on her and the moment she wakes, call me.
0:02:45 > 0:02:50- Morning!- Morning! I swear these bags get heavier by the day.
0:02:50 > 0:02:52Oh, thanks.
0:02:52 > 0:02:54How long have you worked here, Moira?
0:02:54 > 0:02:57Since Gregor was a toddler so, what? 13 years?
0:02:57 > 0:03:00So you'd remember when we all lived here as babies?
0:03:00 > 0:03:03Well, I didn't have security clearance back in those days.
0:03:03 > 0:03:06I just used to pick up and drop off at the main gate.
0:03:06 > 0:03:08But I was aware of children living here, yeah.
0:03:08 > 0:03:12Did you ever meet my mum? Rose Sharpe?
0:03:12 > 0:03:15You're Rose Sharpe's daughter! Oh, my word.
0:03:15 > 0:03:18Yeah, she used to come into the village occasionally.
0:03:18 > 0:03:20She was lovely, Cat.
0:03:21 > 0:03:23"Was"?
0:03:23 > 0:03:28Yeah, I heard she'd died working in...Botswana, was it?
0:03:28 > 0:03:29Borneo.
0:03:29 > 0:03:31And she didn't die, she went missing.
0:03:32 > 0:03:34Both my parents went missing.
0:03:34 > 0:03:38Oh, well. I was just sad she never came to say goodbye.
0:03:38 > 0:03:40Not that we were particularly close friends or anything.
0:03:40 > 0:03:42Maybe she couldn't.
0:03:42 > 0:03:45Maybe she...they left in a hurry.
0:03:45 > 0:03:49Well, that'd make sense with all the stuff they left behind, I suppose.
0:03:49 > 0:03:51What stuff?
0:03:51 > 0:03:53When Dr Morelle moved into the quarters he gave me
0:03:53 > 0:03:56a pile of your parents' clothes to take to a charity shop.
0:03:56 > 0:03:59Dr Morelle took over their quarters?
0:03:59 > 0:04:01It was other personal stuff he kept hold of as well.
0:04:01 > 0:04:03Has he not given that to you?
0:04:03 > 0:04:05- Cat? - DOOR SLAMS
0:04:06 > 0:04:10- Noah! - SHE GASPS FOR BREATH
0:04:10 > 0:04:11My parents used to live at your dad's place.
0:04:11 > 0:04:13He's got some stuff of theirs, Moira told me.
0:04:13 > 0:04:16- I need you to help me get into there and have a look around...- Hey!
0:04:16 > 0:04:20Slow down. You want to get into Duncan's? That's awkward.
0:04:20 > 0:04:25If I'm seen anywhere near his place I'd be like, dead! So...?
0:04:25 > 0:04:28- What about you?- Me?- Duncan likes you, doesn't he?- Mmm...
0:04:28 > 0:04:30You could always lend her your key.
0:04:30 > 0:04:33- You have a key? Why didn't you say? Come on!- Not so fast!
0:04:33 > 0:04:35If I'm caught, it'd be better if you're with me.
0:04:35 > 0:04:38I was going to see if Slim and AJ are OK. They were freaked out
0:04:38 > 0:04:40about something last night and I wanted to make sure that...
0:04:40 > 0:04:43- Noah will go for you, won't you? - Um...
0:04:43 > 0:04:45Yeah, I guess.
0:04:45 > 0:04:47Please, Luke!
0:04:48 > 0:04:52Get used to it, bro. The girl is very bossy.
0:04:57 > 0:05:04I can't decide. Raspberry Sorbet or Sugar Plum?
0:05:11 > 0:05:14Not crying over poor old Lucy?
0:05:14 > 0:05:16Come on, Gaia. What's going on really?
0:05:16 > 0:05:20- What do you mean? - The sudden personality change.
0:05:20 > 0:05:24- Why don't you just admit it? - Admit what?
0:05:24 > 0:05:28- You're trying to be like me, right? - Why would I do that?- It's OK.
0:05:28 > 0:05:32I don't mind. Imitation is the best form of flattery, as they say.
0:05:34 > 0:05:35Gaia, I've just had a call.
0:05:35 > 0:05:38- Your father's on his way back from the airport.- Great!
0:05:38 > 0:05:40I can't wait to see him!
0:05:40 > 0:05:44May as well take what's left of your stuff back to your place.
0:05:46 > 0:05:50Don't look so sad, I know you're totally going to miss me, but...
0:05:54 > 0:05:58Your dad mentioned mirror matter, right? That's got to be the key!
0:05:58 > 0:06:02I thought I'd wake up this morning and this would all be a bad dream.
0:06:02 > 0:06:04But it isn't, is it?
0:06:04 > 0:06:06What was it Luke said last night?
0:06:06 > 0:06:08Something about "same worlds meeting".
0:06:08 > 0:06:11I quite like the way he's got his hair, though.
0:06:11 > 0:06:17Same worlds, parallel worlds, mirror worlds, mirror images...
0:06:17 > 0:06:19Oh, come on, Slim! What's the connection?
0:06:22 > 0:06:23Dimension.
0:06:23 > 0:06:25What if they're from a different dimension,
0:06:25 > 0:06:28- like, like a parallel universe or something!- Yeah, right.
0:06:28 > 0:06:32- That's just like...sci-fi. - No, it's quantum mechanics.
0:06:32 > 0:06:35Look - "The Many World interpretation holds
0:06:35 > 0:06:38"that there are many universes which exist in parallel
0:06:38 > 0:06:40"at the same space and time as our own."
0:06:43 > 0:06:46I'm so sorry, you lost me at quantum.
0:06:47 > 0:06:51I think these are parallel universe versions of ourselves, AJ.
0:06:51 > 0:06:54Is that what they wear in their universe then? Military onesies?
0:06:54 > 0:06:57Slim, AJ, I've brought you some breakfast.
0:07:00 > 0:07:02When I said you were grounded, I didn't mean you
0:07:02 > 0:07:05literally had to lock yourselves in your bedroom for 24 hours.
0:07:05 > 0:07:07Heh, we like it in here. Thanks!
0:07:07 > 0:07:10I'd like a word with my son. In private.
0:07:19 > 0:07:22Don't look so worried, you're not in any more trouble.
0:07:22 > 0:07:24Is this going to take long? Only I'd like to...
0:07:24 > 0:07:26I know this village ban might seem a little harsh, but sneaking
0:07:26 > 0:07:29your girlfriends into the castle was a very foolish thing to do.
0:07:29 > 0:07:32- SLIM:- For the record, Skink is NOT my girlfriend!
0:07:32 > 0:07:34Stop listening at the door, Slim!
0:07:34 > 0:07:37Now, what you've got to understand is that security is paramount
0:07:37 > 0:07:39here at World's End.
0:07:39 > 0:07:42Good. Can we have a guard stationed outside our quarters, then?
0:07:44 > 0:07:47Just to make sure we don't, you know, try and sneak out or anything.
0:07:47 > 0:07:50I don't need to do that. I trust you, AJ.
0:07:50 > 0:07:51Really?
0:07:53 > 0:07:55Is that why you put Spyware on my phone, then?
0:08:01 > 0:08:02KNOCK ON DOOR
0:08:02 > 0:08:04If he's not in, use the key.
0:08:06 > 0:08:07- Luke?- Yeah...- Hi!
0:08:07 > 0:08:12- Hi. Um, you did say we should...catch up sometime.- Er, yes.
0:08:12 > 0:08:14Of course, yeah. Come in.
0:08:14 > 0:08:15Oh, yeah. Both of you.
0:08:17 > 0:08:20So, er, how long have you two been hanging out together, then?
0:08:20 > 0:08:26Oh, well, um, since Noah and Cat had a falling-out and we...
0:08:26 > 0:08:31Since we became...boyfriend and girlfriend, actually.
0:08:31 > 0:08:34He's too embarrassed to tell you!
0:08:34 > 0:08:37Is it OK for me to use your bathroom? I'm busting.
0:08:39 > 0:08:41- A parallel universe?- Yeah!
0:08:41 > 0:08:45And what if this parallel universe is like, dying, OK?
0:08:45 > 0:08:48And that's why they've come here, to take over our world!
0:08:48 > 0:08:51- Yeah, and replace US! - Well, they've already got to Gaia!
0:08:51 > 0:08:52- You guys!- We're serious!
0:08:52 > 0:08:55- NOAH LAUGHS - Show him the photo, Slim.
0:08:56 > 0:08:58And before you say anything,
0:08:58 > 0:09:00we've not messed with it or changed it in any way.
0:09:04 > 0:09:08- This is you guys, right? - In those clothes? As if.
0:09:08 > 0:09:11It was me who took the photo. Last night.
0:09:11 > 0:09:13Wasn't Cat with you?
0:09:14 > 0:09:18So how can she also be in the photo?
0:09:18 > 0:09:19Now do you believe us?
0:09:21 > 0:09:24- Where's your dad?- Gone for milk.
0:09:24 > 0:09:27Why did you say we were boyfriend and girlfriend?
0:09:27 > 0:09:30You looked like you were struggling. Heh. Did you see his face, though?
0:09:30 > 0:09:33I'm obviously a huge disappointment.
0:09:33 > 0:09:36- So anyway, I had a quick look around his bedroom...- You did what?
0:09:36 > 0:09:39You didn't think I'd actually gone to the bathroom, did you?
0:09:39 > 0:09:42There's a cupboard in there, it must be where he stores his stuff,
0:09:42 > 0:09:43but it's locked...
0:09:46 > 0:09:48- Help yourselves. - PHONE RINGS
0:09:52 > 0:09:54- Yes? - LENA:- Duncan, we need you here. Now!
0:09:54 > 0:09:56OK. I'll be right there.
0:09:58 > 0:10:01Sorry, you two. There's somewhere I need to be.
0:10:01 > 0:10:05- Like, now.- Can't we stay and finish our drinks at least?- Um...
0:10:05 > 0:10:09I still have the key you gave me. I could lock up behind us...
0:10:09 > 0:10:15- You did say I could come and go. - Yes, er... Oh, yep. OK, fine.
0:10:15 > 0:10:18Right. Well, I'll catch you later, Luke. Sorry about this.
0:10:21 > 0:10:22Yes!
0:10:23 > 0:10:26We have to find the key for that cupboard.
0:10:30 > 0:10:33You know, I can't imagine what it must have been like for you,
0:10:33 > 0:10:37growing up with no parents at all.
0:10:37 > 0:10:39I used to fantasise all the time that my dad was really alive
0:10:39 > 0:10:42and that one day I'd find him.
0:10:42 > 0:10:44And now you have.
0:10:44 > 0:10:47Hasn't quite turned out the way I thought it would.
0:10:51 > 0:10:52Here, try this.
0:10:57 > 0:10:59Result!
0:11:02 > 0:11:04Guess we've found where he stores his stuff.
0:11:06 > 0:11:08Gaia, I'm back.
0:11:11 > 0:11:14- Hey! How's my favourite girl? - Hello, Father.
0:11:14 > 0:11:18- Welcome home!- "Father"? When did you get so formal?
0:11:18 > 0:11:19Come and give me a hug.
0:11:21 > 0:11:23You OK?
0:11:23 > 0:11:28- You sounded pretty odd on the phone yesterday.- Did I?
0:11:29 > 0:11:31Tell you what, why don't I go and unpack and...
0:11:31 > 0:11:34- and then we can have a proper catch-up, yeah?- Yeah.
0:11:45 > 0:11:48- I want to go home.- And where do you think home is, Gaia?
0:11:48 > 0:11:50In the castle, of course.
0:11:50 > 0:11:53Look, just get hold of my dad, he'll know who I am. Please.
0:11:53 > 0:11:55PHONE RINGS
0:11:58 > 0:12:01- Hello?- Duncan? It's Marcus.
0:12:01 > 0:12:04- I've just got back and there's something very wrong here.- Wrong?
0:12:04 > 0:12:08It's Gaia. She's acting... Well, it's as if...
0:12:08 > 0:12:11- I don't know, I was going to call Lena, but...- No, no.
0:12:11 > 0:12:13Wait there. I'm on my way.
0:12:13 > 0:12:16- Keep her secure.- No! Please!
0:12:18 > 0:12:20DOOR SLAMS
0:12:22 > 0:12:24Cat, there's nothing in there, we have to put the stuff back.
0:12:24 > 0:12:27Hang on! There's some old shoe boxes back here.
0:12:27 > 0:12:29They might have...
0:12:29 > 0:12:31Shoes in them?
0:12:31 > 0:12:33OK. Hold that.
0:12:34 > 0:12:35Cat, seriously.
0:12:35 > 0:12:37If my dad catches us, we're going to be in so much...
0:12:37 > 0:12:40CAT GASPS What is that?
0:12:47 > 0:12:49It's the other half of my necklace.
0:12:54 > 0:12:55This is my mum.
0:12:57 > 0:12:59These are her things, Luke.
0:13:03 > 0:13:06And that's where we saw them, down in the cellar.
0:13:06 > 0:13:09- They must be the ones living in the secret zone.- The secret WHAT?
0:13:09 > 0:13:12The place our parents don't want us to know about, and now I know why.
0:13:12 > 0:13:16- We have to tell the others. - Tell them what, exactly? Noah!
0:13:23 > 0:13:27- Hey! You'll never guess... - You'll never guess, either.
0:13:27 > 0:13:29Take a look at that.
0:13:33 > 0:13:35That's impossible.
0:13:36 > 0:13:40- This isn't me, is it?- It's a parallel universe version of you!
0:13:40 > 0:13:43We've all got one. Me, Gaia, AJ...
0:13:43 > 0:13:46There's no parallel universe, Slim. Don't you get it?
0:13:46 > 0:13:49Those people...are your twins.
0:13:50 > 0:13:53- AJ AND SLIM: Twins? - We've all got a twin?