The Zygon Who Fell to Earth ( audio story ) Publisher ' s summary . " There are no monsters this time . . . are there ? " Ten years later and Aunty Pat is in her prime . She ' s snagged herself an ex rock star at the Kendal Folk Festiva l and now , in the brave new world of the early 1980s they manage together a snazzy hotel on the poetic and shingly shore of Lake Grasmere . However , still waters run deep and friends from the past are returning , intent on milking the old cash - cow . . . " Featuring the song " Falling Star " sung by Steven Pacey with music by Tim Sutton and lyrics by Barnaby Edwards . " Plot . Mervyn Urquhart and Humphrey Mims are en route to the Lake District on a mission . As they arrive at the Bygones Guest House near Lake Grasmere , it becomes clear that they are not what they seem , as Mims refers to Urquhart as Second - in - Command Urtak . Inside the hotel , the Doctor and Lucie are having dinner and debating whether the Doctor was really with Wordsworth during the writing of his poetry . He admits to having misjudged the landing once again , but not by much ; he has brought them to 1984 , and Lucie has somehow managed to bump into her “ Aunty Pat ” again — if an older version of her . It seems the TARDIS has taken a liking to Aunty Pat . Meanwhile Urquhart and Mims check in ; Pat is working the reception desk , and gets them a room . Mims notices the necklace she wears , a gift from her husband Trevor . Urquhart says that he and Mims work in the music industry ; Pat suggests that they may be here for the annual Folk Festival at nearby Kendal — she met her husband there . Urquhart says that he knows her husband , and that they are former colleagues . Pat calls for Trevor , but before he arrives , Mims and Urquhart begin to argue . Trevor meets them and is dumbfounded ; he then becomes hostile toward them , and says they are from his former record company , Satsuma . Mims asks Trevor to help them make a comeback , but he refuses ; he is content with his life here , and does not want to revisit events of twenty years ago . He insists he is not the same person anymore . Urquhart is not dismayed ; he intends to change Trevor ’ s mind . Pat escorts them to their room , and Trevor swears they will not take him back without a fight . The Doctor is surprised by Pat ’ s success , remembering that Lucie had once said Pat never amounted to much ; Lucie admits she also never knew that Pat had owned a hotel in the eighties . Pat , meanwhile , recognises that the Doctor and Lucie both look the same as her last meeting with them , ten years ago . Lucie mentions a rumour of a monster in Lake Grasmere , but the Doctor says they have come to visit Pat and not to investigate . Pat admits that time travel still confuses her — Lucie technically hasn ’ t been born yet — and Lucie admits that she doesn ’ t recall Pat owning a hotel . The Doctor tries to stop her , but the damage has been done ; Pat realises that in the future she won ’ t be happy or successful , and tells Lucie to stop telling her about the future . Lucie tries to change the subject , and asks to meet Trevor , but Pat says he is in a bad mood , and describes the encounter with Mims and Urquhart . Trevor was once a folk singer with a few hits , and perhaps the remix album — which Mims and Urquhart have just released — will bring in some income . Still , Trevor seemed scared . Later , Lucie asks the Doctor about Pat , and why she never mentioned this part of her life . They are interrupted by the arrival of Mims and Urquhart ; they hide and eavesdrop on the duo . Mims mentions a suspicious room beneath the lounge bar ; he also says that Trevor goes to the lake every evening to drink supplies . They leave for the lake , walking in the moonlight . Lucie decides to follow them , intending to meet the Doctor back here at midnight . At the lake , Lucie watches as Urquhart and Mims are met by an alien — a female Zygon , named Grakus . She reports seeing their target earlier in the evening . Urquhart tells her to summon the beast , as he and Mims also need “ supplies ” . Grakus uses a device to summon a creature from the catacombs under the lake . A sea creature — a Skarasen — rises from the lake ; Mims draws lactic fluid from the creature for the three Zygons — for that is what Mims and Urquhart are as well . Disgusted , Lucie steps on a twig , and is seen by the Zygons ; Mims recognises her , and Urquhart grabs her . They refuse to let her go . Later , Lucie finds the Doctor in the hotel bar , which is closed . She drinks half a pint of vodka at once , which shocks the Doctor ; she insists that Urquhart and Mims are normal people , but that she and the Doctor must investigate the cellar . The Doctor agrees , and goes downstairs with her . Inside the cellar , they find Trevor encased in a machine . The Doctor recognises it as a body - print machine , used to allow a shapeshifter to mimic someone ’ s form and personality on a continuing basis . He looks well , and is only hibernating , but he could have been here for years . Aunty Pat , it seems , is married to a Zygon ! Lucie wants to tell her at once , but the Doctor opts to leave it for morning . In the morning , the Doctor and Lucie meet Pat at breakfast . She talks briefly about Trevor , who still considers himself a radical , even refusing to have a car because of its effect on the atmosphere . Lucie tells her that something terrible is hidden in the cellar ; Pat tries to let the topic go , but Lucie reveals that Trevor is a Zygon . Pat stuns them both when she says that she already knew ; in fact , she turns the conversation and says that they are showing prejudice against aliens . The Doctor insists that Zygons are evil . Pat calls Trevor in to challenge that view , and tells him that they know about him , and are unhappy about it . However , she denies knowing anything about the real Trevor in the body - print machine . When Trevor arrives , the Doctor challenges him , but Trevor insists he ’ s not planning anything . He insists he has been here for years , and loves humanity , but especially Pat . He reverts to Zygon form to prove that Pat doesn ’ t mind his true form ; she hugs him to demonstrate it . Finally the Doctor acquiesces , and apologises for Lucie ’ s rude behaviour , saying that she has not been herself today . Trevor leaves to return to the reception desk , with Pat reminding him to change back to human form . In the hotel room , Urquhart says that the Skarasen has returned to the ship under the lake , and Phase Three can begin . He sends Mims to retrieve a Zygon device from Pat , but first they are interrupted by the arrival of Lucie . . . who changes into Grakus . She describes her encounter with Pat downstairs , and explains that Warlord Haygoth — that is , Trevor — is in love with Pat . They conclude that Trevor is about to betray them . Urquhart decides to accelerate Phases Three and Four , and Grakus decides to do something about Pat . Downstairs , Pat hears the remix of Trevor ’ s old song , “ Falling Star ” , on the radio , and calls him to listen in the kitchen . Mims comes as well , but she tells him he is not allowed there . He apologises and changes the subject to Pat ’ s unusual necklace . She admits that Trevor gave it to her at the folk festival in 1979 , and she has worn it sense . Mims tries to snatch it back , shouting that it is crucial to the Zygon plans ; but Pat cries out in pain , and he realises it is fused to her flesh . With no choice , he renders her unconscious and takes her with him . Later , Trevor blames himself for her kidnapping . Lucie offers him a drink , and when he refuses , she drinks it herself . He tells her that the necklace is a Zygon device . The Zygons are based five miles away — or three by underground travel — at Ullswater . He admits to being reliant on the Skarasen ’ s lactic fluid , which is why he couldn ’ t take Pat away from here . He had arranged a tunnel from Ullswater to Grasmere for the creature , and programmed it to obey him above all others . He tells the Doctor that he expects the Zygons have some plan that requires him as their Warlord . The sun is setting , and so the Doctor takes them to find the tunnel ; Lucie expresses distrust of Trevor . Meanwhile Urtak and Mims revert to Zygon form . Urtak debates with Pat about her love for Trevor , and about the validity of love in general . Finally Urtak tells Mims to render her unconscious again . Mims admits — to Urtak ’ s disgust — that he may have experienced some human emotions . Urtak decides they must hurry back to the ship ; they have been away for ten years , and it may have repaired itself by now . At the tunnel , Lucie yells ahead several times , until the Doctor stops her . He allows her to lead the way in , hoping the Skarasen is away . Trevor mentions that there have been sightings of it in the area in the past ; the Doctor notes that Lucie doesn ’ t recall this from last night ’ s conversation . When Lucie changes the subject , Trevor explains that the ship is damaged , and explains how the Skarasen feeds the crew . Lucie inquires about the Doctor ’ s past defeats of the Zygons , but he claims to have forgotten how he did it . The Skarasen approaches , and the Doctor uses his sonic screwdriver to confuse the electronic half of the beast ; Lucie accuses him of leading them to their deaths . Mims and Urtak watch the tunnel on the ship ’ s scanners , but note that Grakus is also vulnerable in human form . Although Urtak would sadistically allow the creature to hurt them , he sends guards into the tunnel to bring them in . Meanwhile , Trevor reverts to Zygon form and declares himself the Warlord Haygoth , in an attempt to control the Skarasen . He sends it away , but not before it strikes Lucie and dashes her against the wall . She is bleeding , but refuses to let the Doctor help her . Mims arrives to capture them , and welcomes the Warlord home . Pat wakes up near Urtak , but fails to appreciate the ship . As Mims arrives with captives , Pat tries to warn Trevor , but Urtak silences her . She asks to see her husband before the prisoners are taken to cells , but Urtak refuses , and says that Haygoth is confused and needs their help to think clearly . He has them placed in a cell , as Trevor reverts to human form in an insult to the other Zygons . The Doctor demands to know where the real Lucie is , and tells Grakus to stop pretending ; he has known since last night that she was an imposter . Grakus reverts to Zygon form , but retains her injury , which Mims notices . Grakus trades arguments with the Doctor , who tells her that there are other Zygon ships on Earth ; she tells him that Lucie and Pat are safe , as there is a body - print chamber on the ship . Grakus leaves . The Doctor begins getting them out of the cell with the sonic screwdriver . As he works , he tells Trevor they will have to discuss the real Trevor ’ s fate . Trevor says the real Trevor has been dead since a motorcycle accident in the late sixties ; only his body is kept alive in cryogenic suspension . The Doctor apologises for making assumptions , and pledges to help the Zygons get offworld in exchange for Lucie and Pat . However , Trevor is sure they won ’ t give up so easily — they plan to adapt the Earth to their own needs by accelerating global warming . Their early forays into the music industry have given them capital to invest into heavy industrial projects around the world . In addition , they have biochemical warheads on the ship ; Phase Five of the plan will detonate the warheads in the atmosphere for further gases . However , they need the device Pat wears in order to activate the torpedo tubes . Mims reunites Lucie and Pat in front of Urtak , and they update each other on the situation as they know it . Urtak reveals that he needs the necklace , but it remains fused to Pat ’ s flesh . Lucie begs Pet to surrender it , and then tries to rip it from her ; finally , Lucie reverts to Zygon form , and manages to pull the necklace free , although it nearly kills Pat — and in fact , it leaves Pat ’ s throat torn open . Elsewhere , the Doctor denounces Trevor for giving such a dangerous object to Pat ; Trevor admits his foolishness , but could not take it back once it was given . They are interrupted by an alarm ; Urtak announces that Phase Five will begin , and orders the crew to arm the warheads . This means they have obtained the necklace , which may have killed Pat ; Trevor says that if Pat is dead , he can ’ t care what they do to Earth . However , the Doctor still cares ; and he takes Trevor with him to the control room . With the necklace in place , the warheads are awakening . The injured Pat calls to Lucie for help , but this Lucie is still the Zygon duplicate . Another alarm sounds ; power levels are too high and are overwhelming the ship — as Grakus explains , only the Warlord would know the right settings . Before Urtak can send for Trevor , he arrives , still in human form , and rushes to Pat ’ s side . The Doctor has him put pressure on her wound . Pat thinks she is dying , and asks the Doctor if Lucie was ever real ; he assures her she is , and promises to save her . She says she sees disaster , death , and darkness around the Doctor ; and then she falls quiet . The Doctor tells Trevor she is dead . Urtak urges Trevor to focus and launch the torpedoes . Grakus adds to the temptation , telling him he can have as many human women as he wants — even Lucie , if he wishes . The Doctor encourages him to take the necklace and allow the Doctor to hide it ; but Trevor says that it would fuse with the Doctor as with Pat , and he would become another target . He appears to give in to Urtak , saying there is nothing here for him now . He sends the Doctor to the body - print chamber to wake Lucie , against the others ’ protests ; then he tells the Doctor to leave with Lucie and warn Earth — and the rest of the galaxy — of what is coming . The Doctor leaves , and Trevor reverts to Zygon form . He tells Urtak that he has triggered the warheads ; then he summons the Skarasen , allowing Urtak to believe he is sending it to kill the Doctor and Lucie . He orders it to attack . With difficulty , the Doctor rescues Lucie from the body - print machine , just in time to hear the Skarasen roar . They run as the ship starts to shake . Meanwhile the Zygons are stunned to see the Skarasen attacking their ship . Urtak begs Haygoth to call it off , but he refuses ; reverting to human form , he says that his name is Trevor . He reveals that he sent the Skarasen to attack the warheads ; they accuse him of betrayal , and remind him that the warheads are primed . He knows ; when damaged , the warheads will vent into the ship . Urtak and the others sting Trevor to death . Lucie is confused when the Doctor tells her Trevor has saved the planet ; she never knew he was a Zygon . They will discuss it later ; for now , they have about thirty seconds until the tunnel floods . They run from the inrushing water . . . Trevor refuses to die from the Zygon stings ; he tells them their time has passed , and they will soon be dead . He insists their race has done enough damage , and doesn ’ t deserve to live . As the controls overload , he dedicates his actions to Pat ; then the ship explodes . At the hotel , Lucie brings the Doctor some tea . In a few hours , the guests will awaken , but there is no one to make breakfast . The Doctor reveals that the machine in the cellar has crumbled to dust , along with the original Trevor ’ s body . Lucie muses about Zygon Trevor ’ s death , and wonders how they will tell Pat ; the Doctor prepares to tell her that Pat is dead . Before he can do so , Lucie pieces together what he is about to say ; but she denies it , and insists that Pat must be alive , as Lucie will see her as late as 2007 . The Doctor explains that the Web of Time is resilient enough to allow some events to be changed — and as Pat was known to live a quiet , unobtrusive life , history may be able to miss her . This upsets Lucie even more , but the Doctor says that Pat was a heroine . Nevertheless , Lucie wants to stay and wait , so the Doctor sends her to bed . The Doctor takes his tea to the terrace to watch the sunrise . Once alone , he tells Trevor to come out of hiding in the bushes . He is glad to see Trevor , but Trevor wishes he could have saved Pat . He plans to use his last power to disguise himself in human form again ; to the Doctor ’ s surprise , he can do so even without a body - print , and create a form that will endure for decades , but only if he assumes the form permanently . He is content to be human , though ; and when he changes , it is into Pat ’ s form . Thus Lucie will be pleased , as her memories will remain intact . Trevor / Pat asks the Doctor not to tell her the truth ; he reluctantly agrees .