The Space Museum ( TV story ) The Space Museum was the seventh story in the second season of " Doctor Who " . It was the first story to deal with the dimensions of time as well as space and the first to feature alternate timelines . While it presented many original science fiction elements , it still retained the elements of a typical story of the era . The story ' s cliff - hanger also presented fans with a preview of the Dalek s ' third appearance . Their return was awaited impatiently , a fact that was baited by the appearance of a Dalek shell in part one . This shell was the final appearance of the original Dalek design until " The Magician ' s Apprentice " in 2015 . The Daleks at the end of " The Final Phase " do not have the metal band of their predecessors . Synopsis . The TARDIS jumps a time track and the travellers arrive on the planet Xeros . There they discover their own future selves displayed as exhibits in a museum established as a monument to the galactic conquests of the warlike Morok invaders who now rule the planet . When time shifts back to normal , they realise that they must do everything they can to avert this potential future . Vicki helps the native Xerons obtain arms and revolt against the Moroks . The revolution succeeds and the travellers go on their way , confident that the future has been changed . Plot . The Space Museum ( 1 ) . The TARDIS materialises on a planet replete with many different specimens of space technology . The Doctor says they landed far quicker than he ever has before . Ian and Barbara find they have switched clothes since just before they landed . They had been in their 12th century Crusade clothes . The Doctor explains this away as being merely " time and relativity " . Their old clothes will be hanging in the wardrobe . Vicki confirms this . Following the Doctor ' s orders she also fetches a glass of water from the food machine . She is startled by something that makes her drop the drink . As the glass smashes on the floor , it immediately reforms itself and leaps back into her hand . She reports this to the Doctor , who says all should be explained when they explore the planet . He postulates it is a museum because the spacecraft are lined up in chronological order . Once they leave the TARDIS , they find the planet has nothing living on it . Ian notices their footprints make no tracks in the dust . They head towards a large building in the middle of the spacecraft . Once there they find the doors shut , but they soon open to reveal two men . The travellers hide from them , but as they pass Vicki sneezes loudly . To the travellers ' surprise the two men do not seem to hear her . The Doctor says this is unexplainable and begins to explore the building . As they walk through the many corridors , they are startled by a Dalek , which they realise is only a museum piece . As they discuss Daleks , about which Vicki has only read , they see two more men coming . They hide but are surprised to see that , although the men seem to be speaking to each other , they are inaudible to the travellers . Ian wonders if they speak at another frequency than humans . The Doctor doubts it but has no other explanations . As they continue to explore the museum , Vicki discovers that they cannot touch any of the pieces on display . Their hands simply pass through them . The Doctor suggests they are not actually where they think they are . Yet again , they encounter three men who go about their business , unaware of the travellers . This supports the Doctor ' s theory . Further in the museum , they find the Doctor ' s TARDIS on display . Barbara , Ian , and Vicki , although confused as to how the ship came to be here , say they think they should leave the planet . The Doctor soon proves this to be impossible . The TARDIS also cannot be touched . The Doctor points out a display case containing the bodies of the four travellers . He says the TARDIS must have jumped a time track when they materialised . Thus they temporarily occupy a fourth dimension . This lets them be simultaneously in the cases in one reality and standing , looking at themselves in the fourth dimension . The Doctor suggests that the only course of events is to wait at the museum until they return to the real reality . He suggests that what they are seeing in front of them is merely a possibility of the future and it can be changed . He notes that the versions of them in the display cases are wearing the same clothes as they are wearing now , so it is only a matter of time before the two realities merge again . No sooner does he say this than Barbara has a strange feeling . Time seems to rewind and two men discover the TARDIS . At the same time , the display cases disappear . The Doctor announces , " We have arrived . " The Dimensions of Time ( 2 ) . The museum ' s curator , Lobos , receives news of the alien ship that has landed on his planet . Although concerned , he is also pleased to have his day ' s monotony broken by an intruder . He orders his men to find the visitors before the rebels find them . However , he is too late — three rebels have already heard about the travellers and intend to intercept them before Lobos ' men . They will befriend them and overthrow the oppressive rule that Lobos , a representative of the Moroks , holds over them . Meanwhile , in the museum the travellers have taken a gun from the exhibition to bluff their way out of the museum . The four friends discuss how best to avoid the future that they saw in the fourth dimension . It is suggested that they do the opposite of what they would normally do , but they decide to try to escape . If they escape , then they will never be captured in the first place . They begin to navigate the labyrinthine corridors , searching for escape . As they make their way through the corridors , they are pursued by the rebels , who decide that , to avoid startling the travellers , they will capture one of them and explain their situation . It is not long before the opportunity shows itself . As the travellers walk through the corridors , the Doctor is distracted by an exhibit and falls behind his friends . The rebels grab him and carry him away through a door without the others seeing . He plays dead and the rebels decide to split up . One of the rebels , Darko , elects to stay and watch the Doctor while the others go to track the other travellers . The remaining travellers , now aware of the Doctor ' s disappearance , argue how best to find him and save themselves from their possible future . They decide it is best to push on for the exit . The two rebels return to discover that Darko has been tied up and gagged . They question him about what happened , but he has no memory after being knocked unconscious . They go to seek the Doctor , who they assume escaped back into the museum . However , he is hiding in the hollowed out Dalek shell . When he escapes , he is accosted yet again , but this time by the Moroks . Barbara , Ian , and Vicki , now tired and cranky , decide to use yarn to ensure that they are not repeating their paths . They unravel Barbara ' s cardigan to do this . The rebels find the yarn and decide to follow it . Eventually they find the exit . As they pull back the doors they see that the TARDIS has been captured . The Doctor finds himself in a room with only a chair . As he sits on it , bars lock him in place . A wall slides up to reveal Lobos . He explains that the museum is an homage to the great history of the Moroks and it is silent because the Moroks are now peace - loving creatures . Lobos asks the Doctor with whom he came here . The Doctor refuses to say , but Lobos somehow knows anyway . He explains that the Doctor ' s chair allows his thoughts to be shown on a video screen on his desk . When Lobos continues to question the Doctor on how he came here and where he is from , the Doctor uses the strength of his brain to confuse and misdirect Lobos . Lobos tires of this and summons his guards to take the Doctor to the preparation room . He will become an exhibit , causing an image of the Doctor on display to appear . The Search ( 3 ) . Barbara , Ian and Vicki look on as the Moroks decide to try to force their way into the TARDIS . One of the Morok soldiers is sent to fetch cutting equipment . As the humans discuss what they should do , a Morok finds them and holds them at gunpoint . Ian decides that if they are to be put in the exhibition cases in the future , the Morok soldiers must have been told not to kill them . The gun must be a deterrent , not a threat . Ian calls the soldier ' s bluff and overpowers him . The other Moroks overhear the scuffle and rush to try to catch the travellers , but in the panic the humans flee in different directions . Barbara hides behind a stack of boxes . The Moroks leave without seeing her , but she finds they have locked the door , trapping her . Vicki escapes from the Moroks another way and gets captured — not by the Moroks but by the rebel faction . At first she is terrified of her captors , especially when she hears that they captured the Doctor , but the rebels insist they wish her no harm . This is proved when they send one of their number , Dako , to find Barbara . Ian elects to hide behind the TARDIS . He overhears a conversation between a Morok guard and Lobos over instructions to guard the TARDIS while the rest of the army track down the " aliens " . Using a stone to distract the guard , Ian overpowers him and holds him at gunpoint . He orders the guard to take him to where the Doctor is being held . The guard informs him that it will be too late for the Doctor , but Ian insists . Lobos is tired of the aggravation from high command , what with the aliens running loose on his planet and the ever - growing number of Xeron rebels on his base . He elects to flood his museum with Zaphra gas . This paralyses anyone who inhales it , making all the Moroks ' enemies easy pickings . Dako finds the room in which Barbara is hiding but is almost knocked unconscious by a terrified Barbara . He says her name ; this calms her . Dako says his race is called the Xerons . They are the original occupants of this planet , but the war - loving Moroks took over their planet to establish their museum . The Moroks swept away the Xeron civilisation and killed all the Xeron people except the children , whom they enslaved . These are the Xerons that now live underground in the museum . The conversation is interrupted by the Zaphra gas that floods into the room . Barbara and Dako try to escape before falling under the gas ' paralytic effects . Vicki is also being given a lesson on Xeron history . The Xerons admit that whilst they are more numerous , they do not have the artillery to overpower the Moroks . Vicki asks if there is an armoury that they can raid . The Xerons say that there is , but it is protected by a lock with a lie detector . Unless you answer a series of questions truthfully , you cannot enter . Vicki asks to be taken to this machine , and the Xerons willingly oblige , happy to have an addition to their revolutionary force . Meanwhile , Ian and the Morok guard have arrived at the Preparation Room where the Doctor is being held . The guard suggests waiting until it isn ' t as busy to enter . Ian agrees . They are soon interrupted by Lobos . Ian hides while the Moroks talk . Ian learns that his friends have not been captured but gas will be used on them . They hide until the Preparation Room may be more accessible . Sita , Tor and Vicki arrive at the armoury . Vicki listens to the questions that the complex telekinetic lock asks . As soon as she has heard the full cycle , she takes off the front of the machine and tinkers with its workings . She gets the machine to ask her the questions again . When asked what her name is , she responds with " Vicki " , and when asked what the guns are to be used for , she responds " revolution . " To the surprise of the Xerons the doors open . While the Xerons begin arming themselves Vicki explains that she wired the machine to accept any truthful answer , not just the ones that the Moroks were looking for . Lobos is interrupted by Ian , who has gained access to the Preparation Room . Ian holds Lobos at gunpoint and demands to see the Doctor . Lobos obliges , saying there is no point . Ian stops in his tracks , shocked at the state the Doctor is in . The Final Phase ( 4 ) . Ian finds the Doctor attached to a device , unconscious . He demands that Lobos reverse whatever it is that the machine has done to the Doctor . Lobos says the Doctor is as good as dead and it would be impossible to revive him . It has never been done before . Ian forces Lobos at gunpoint to do so . Meanwhile , Tor marshals the Xeron revolution . He orders his newly armed platoon to attack the barracks . As they do , Vicki says she wants to help find her friends . After arguing briefly , Tor agrees but sends Sita to protect her . Back in the preparation room , Lobos has defied the odds and resurrected the Doctor . The only side effect the Doctor displays is a bit of rheumatism from the extreme cold to which he was subjected . As the Doctor and Ian discuss their next move , a group of Moroks silently ambush them , knocking Ian unconscious . Once Lobos has imprisoned the two men , he tries to call the barracks to muster more men to find the rest of the aliens . There is no answer . Outside where a Morok soldier guards the TARDIS , the doors to the museum spring open to reveal Barbara and Dako . Barbara has carried Dako to safety after he collapsed from the Zaphra gas . The guard pulls his gun on them when a shot rings out and he falls . Barbara and Dako turn to see Vicki and Sita , who is holding a gun . Sita tells Dako about the revolution . Barbara and Vicki decide to join them , hoping they will find the Doctor and Ian on the way . Whilst they talk , another Morok soldier appears . He shoots Dako and Sita and takes Barbara and Vicki prisoner . The soldier returns Dako and Sita ' s guns to Lobos . Lobos says it is from the armoury and worries he cannot contact his soldiers there either . The four travellers are reunited , locked in the Preparation Room . In a futile effort to render their possible future redundant , Ian destroys the machine that turns them into exhibits . However , the Doctor speculates that there are many more on the planet . Ian and Barbara seem resigned that there is no escaping the future they saw , but Vicki and the Doctor say that ever since they touched down on Xeron they have been altering and affecting the course of events — although they can ' t alter their own chain of events while imprisoned , they may have made an impression on others , who will do it for them . Outside , the Xerons overpower the Moroks in the battle for Xeron . The Xeron rebels include Sita and Dako , who were only paralysed by the blast from the Morok soldier . Tor finds them and demands to know what happened to Vicki . Sita says that they were taken to the Preparation Room . Tor and his men go after her . Outside the Preparation Room , Lobos receives news that defeat is inevitable . He decides to flee the planet and orders the killing of his prisoners . Just as the travellers are about to be killed , Tor and the rebels burst through the door and kill Lobos , freeing the Doctor and his companions . Later , reunited with his TARDIS , the Doctor explains to Ian and Barbara the problem he had with his TARDIS was all down to a small part that hadn ' t quite clicked into place — this meant that they had been wandering around Xeron for a while before it clicked back into place and re - landed again , resetting time . Ian asks what the Doctor has brought with him . The Doctor says it is a Time - Space Visualiser the Xerons gave him as a souvenir before they dismantled the museum . He will be able to get it working again , but leaves its actual use a mystery . Vicki bids goodbye to Tor and enters the TARDIS , which dematerialises . On a distant planet , a Dalek enters a control room in response to an alarm call . It informs another Dalek via a communications panel that their " greatest enemies " have left Xeros . The response from the Dalek at the other end is that the Daleks ' own time machine will soon be in pursuit and their enemies will soon be exterminated . . . Home video and audio releases . Digital releases . This story is available : VHS releases . " The Space Museum " was released on VHS together with the surviving episodes of " The Crusade " .