A group of teens from very different backgrounds move into a remote castle and soon find themselves on a journey full of mystery and secrets.A group of teens from different backgrounds find themselvesA group of teens from different backgrounds find themselves in a remote castle together.Ever since the twins arrived, someone has been watching them, even as they sleep.Cat has a flashback which really disturbs her and she triesCat has a flashback which really disturbs her and she tries to leave.Ghostly figures appear to Luke, Slim and AJ but seem toGhostly figures appear to Luke, Slim and AJ but seem to vanish into thin air.Noah enters Duncan's apartment to get a map and is caught inNoah enters Duncan's apartment to get a map and is caught in the act.The ghosthunters are uncomfortable when they find theThe ghosthunters are uncomfortable when they find the holding cells, and Gaia is spooked.Noah and Cat discover a hi-tech elevator which takes themNoah and Cat discover a hi-tech elevator which takes them deep under the castle.Noah and Cat search for an escape route. Although Gaia, Slim and AJ think the Castle is haunted, the twins chase after what turns out to be a very real person.JavaScript seems to be disabled. Drama series.
someone has been watching them, even as they sleep. Casey tells Cat he's been herIs Casey friend or enemy? ultimatum, and there is some shocking news for the scientists.

The Morelles attemptLexy has a dream - or is it a memory?

Casey tells Cat he's been her benefactor throughout.Cat finds herself being assessed as part of a flightCat finds herself being assessed as part of a flight simulation team.The twins explain they are pioneers training to build lifeThe twins explain they are pioneers training to build life on a new planet.Cat insults Noah - now he trusts Casey, will he betray her?Cat insults Noah - now he trusts Casey, will he betray her?Noah tells Casey everything that the teens have learned.Noah tells Casey everything that the teens have learned.Slim and AJ venture to the SZ for the first time and meetSlim and AJ venture to the SZ for the first time and meet their twins.With Lars's help, Lexy battles the lasers but a piercingWith Lars's help, Lexy battles the lasers but a piercing alarm is sounded.The alarm causes everyone to scatter, and Casey is in bigThe alarm causes everyone to scatter, and Casey is in big trouble with Lena.Lena puts the SZ out of bounds but when has that everLena puts the SZ out of bounds but when has that ever stopped Cat and Luke?After more revelations, Luke and Noah have some difficultAfter more revelations, Luke and Noah have some difficult questions to ask.Mac and Skink are convinced aliens have abducted Gregor.Mac and Skink are convinced aliens have abducted Gregor.Casey gives Noah some positive encouragement, but spins theCasey gives Noah some positive encouragement, but spins the facts surrounding the SZ.Casey gives Moira an ultimatum, and there is some shocking news for the scientists.The teens are sent to pack but begin to rebel against the adults' plans for them.The clock is ticking, and the teens take on their biggest challenge yet.The teens persuade the adults to test a theory they haveThe teens persuade the adults to test a theory they have come up with.Casey's selfish game plan becomes very clear and Noah has toCasey's selfish game plan becomes very clear and Noah has to make a big decision.Everyone at the castle accepts the inevitable, but Noah hasEveryone at the castle accepts the inevitable, but Noah has information that might help. Please enable JavaScript to take full advantage of iPlayer.A group of teens from different backgrounds find themselvesA group of teens from different backgrounds find themselves in a remote castle together.Cat has a flashback which really disturbs her and she triesCat has a flashback which really disturbs her and she tries to leave.Ghostly figures appear to Luke, Slim and AJ but seem toGhostly figures appear to Luke, Slim and AJ but seem to vanish into thin air.

Created by Danny Spring, Diane Whitley.

The Morelles attempt to play happy families.An anxious Lexy has bad memories of the sci-fi area.Slim and AJ see more doubles of Gaia and worry that the realSlim and AJ see more doubles of Gaia and worry that the real Gaia is being held hostage.The real Gaia is distressed at being trapped in the SZ.The real Gaia is distressed at being trapped in the SZ.Noah drops his ID card as they leave the monument and CaseyNoah drops his ID card as they leave the monument and Casey picks it up.Cat takes Moira into her confidence but then thinks MoiraCat takes Moira into her confidence but then thinks Moira has betrayed her to Duncan.Cat and Lexy sneak to the SZ during the night to talk toCat and Lexy sneak to the SZ during the night to talk to their twins.Casey shows Noah toxic chemicals in the SZ - has this beenCasey shows Noah toxic chemicals in the SZ - has this been the plan all along?Is Casey friend or enemy? A group of children from diverse backgrounds are taken to a mysterious remote Scottish castle which houses a secret army research centre for an unknown purpose. A group of teens from very different backgrounds move into a remote castle and soon find themselves on a journey full of mystery and secrets.