Planet of Evil ( TV story ) Planet of Evil was the second story of season 13 of " Doctor Who " . It borrowed heavily from Robert Louis Stevenson ' s 19th century novel , " The Strange Case of Dr Jekyll and Mr Hyde " , featuring both a planet and a protagonist that display a duality of nature . Roger Murray - Leach designed the jungles of Zeta Minor to be imposing . He wanted to create a contrast with " Star Trek " , another popular sci - fi series , that often used abstract sets . The set was popular with the BBC ' s prop department , which went some way to securing Murray - Leach forgiveness for inadvertently destroying several hundreds of pounds of stock scenery by making the jungle difficult to disassemble . Synopsis . Picking up a distress call from the edge of the known universe , the Doctor and Sarah Jane find themselves on Zeta Minor where a geological team has run afoul of some strange goings on . . . Plot . Part 1 . On a dark and distant planet , a spaceman named Braun steps out of a small base unit and plants a sign in the jungle . It carries the name and date of death of Egard Lumb . Unearthly howls echo around him , and he points a rifle warily at his surroundings before returning to the base . Meanwhile , elsewhere on the planet , another spaceman , Baldwin , finds crystals near a pit . He hands them over to Professor Sorenson . Baldwin receives a call from Braun ; it is nearly night , and they need to get back to base quickly . Sorenson notes the vein they have uncovered in sector 5 is almost seventy percent pure . The last time they hit a vein this rich , Lorenzo died and the vein vanished . Sorenson says the planet is alive and took the vein back but vows he will not be beaten again . Unable to persuade Sorenson , Baldwin leaves him . At base camp , Braun is attacked by an invisible force . He vanishes , screaming . When Baldwin makes it back to the base , he is also attacked , just managing to send a distress signal before he , too , vanishes . In the TARDIS , Sarah wants to know what is wrong . The Doctor had promised they would be back in London five minutes before they left Loch Ness . The Doctor admits that they have emerged from the time vortex thirty thousand years too late . The TARDIS receives Baldwin ' s distress call , and the Doctor lands the ship . They emerge in the jungle , the Doctor tracking the signal with a small device . Suddenly , Sarah seems transfixed by a strange noise and stares straight ahead at something unseen until the feeling passes . A probe ship approaches Zeta Minor , the last planet in the known universe . The ship ' s controller , Salamar , assigns Vishinsky , the most experienced crewmember , to lead the landing party . The ship has barely enough fuel to make the return journey — they do not have power for a scan before sending the party down to locate Sorenson and his team . The Doctor and Sarah reach the base . They discover Braun ' s almost mummified body on the ground . The base unit ' s interior is dark . The Doctor surmises they are some months too late . Sarah goes back to the TARDIS to get his spectromixer so he can fix their position while he tries to restore the base ' s power . When Sarah leaves , the Doctor discovers Baldwin ' s body in the same mummified state . Sarah makes it back to the TARDIS , entering as the armed landing party draws near . Vishinsky calls the probe ship , and Salamar orders the TARDIS brought to the ship and placed in quarantine . The landing party places a clamp on the TARDIS door , trapping Sarah , who has no idea what is going on . The police box is transmat ted away . The landing party spots Sorenson , who , although acting a bit strangely , assures Vishinsky he is all right and his theory about Zeta Minor has proven correct . He found the vital discovery last night in Sector 5 . Sorenson believes Baldwin returned to the base , suffering from fatigue . He leads the party to it . Vishinsky asks about the other six members of his expedition . Sorenson is evasive about the exact number and concedes they have lost some people , but the important thing is that the mission is a success . When they reach the base , the landing party find the Doctor working on the systems next to Baldwin ' s body . Sorenson is startled to see the corpse . He says Baldwin has been murdered . . . just like the others . Sarah finally finds the TARDIS doors unlocked and steps out to find herself on board the probe ship . Salamar tells her she is in orbit over Zeta Minor and a prisoner of the Morestran s . Salamar contacts Vishinsky and tells him to keep a careful watch on the Doctor while he questions Sarah . Salamar does not believe Sarah and the Doctor just " picked up " the distress signal , as Zeta Minor is so remote . The ship lands on the planet near the base . Sorenson says they had only been working a few weeks when the killings began , always at night . Salamar believes it is the work of alien infiltrators and suggests the Doctor confess before he is subjected to interrogation . When Salamar is told there is no sign of life anywhere else , he concludes the Doctor and Sarah must be responsible and gives the order for their execution . However , the Doctor and Sarah are escaping through the window of the store room in which they are held , whose magnetic locks are weak due to the power loss . The moment they step out , they encounter a semi - transparent , monstrous figure , its outlines glowing red , reaching out for them . Part 2 . One of the guards , O ' Hara , fires at the creature , but it grabs him and he vanishes , screaming , only for his body to reappear , drained and mummified like the others . The Doctor is not sure what the creature is but tells Sarah he has a very unpleasant theory . Ponti , who heard O ' Hara ' s screams , informs Salamar that the base in under attack and they find the two time travellers missing . The Morestrans fire at them as they run away into the jungle . Dawn breaks on Zeta Minor and the creature does not seem to like daylight . Vishinsky launches the oculoid tracker , a flying drone with a camera eye , to search the jungle for the fugitives . Meanwhile , Sorenson confirms that O ' Hara died the same way as the other members of his expedition , through total dehydration — a kind of rapid freeze drying . Sorenson brushes off the deaths as irrelevant . His mission to Zeta Minor was to find a new source of energy to replace Morestra ' s dying sun , and he has succeeded . Sorenson demands that his mineral samples be taken aboard and they leave the planet immediately . However , Salamar says that alien forces must be found and eliminated . The tracker finds the Doctor and Sarah near the pit in Sector 5 , a dark pool with no reflection . A party arrives , led by Ponti , but as they search the two roughly , Ponti falls into the pit with a cry . The Doctor warns the rest back , telling them they are tampering with the balance of nature on the planet and it may already be too late . At the base , Sorenson gets De Haan to help load his canisters of refined ore onto the ship . Sorensen excitedly notes that six pounds of ore could produce heat equal to the output of their sun for three centuries ; full scale exploitation of Zeta Minor would provide perpetual energy . The Doctor implores Salamar to listen to him : Zeta Minor is the boundary between the known universe and one of anti - matter . In coming here , they have crossed that boundary . He warns Sorenson that if he takes those samples , they will never leave this planet , but Salamar orders the Doctor and Sarah taken to the quarantine area . Sarah suggests they simply leave in the TARDIS , but the Doctor says that the Morestrans are endangering the universe as well as themselves . He opens a canister of refined ore and takes a few crystals , placing them in an old toffee tin to test a theory . The ship tries to take off , but the systems do not respond properly . The creature attacks the ship . The force fields are raised , but there is not enough power to repel its pure energy form . Several Morestran crewmen rush out to fire at the creature , but to no avail . It drains them one by one . The Doctor tells them to link the force field to the atomic accelerator . Salamar hesitates , but Vishinsky says they have to try , and he reluctantly gives the order . This seems to work ; the creature is driven back and vanishes . The Doctor tries to reason with Sorenson ; as long as the ore is aboard , the creature will return , and they will be trapped here . If they jettison the canisters and make clear their intention to leave empty - handed , they will be allowed to take off . The Doctor offers to communicate that intention to the creature . Salamar agrees to let him go alone but launches the tracker to observe him . When the Doctor reaches the pit , the creature rises , engulfing the Time Lord . He falls into the pool . . . Part 3 . The Doctor seems dead . Sorenson asks Salamar to take off , but Salamar wants the ore samples removed first . As they argue , Sarah slips out of the ship into the jungle . As De Haan and Morelli start to transfer the canisters , Sorenson sneaks into the quarantine area and takes one away . The Doctor continues his seemingly endless fall through darkness , slowing until he is suspended , floating before the gigantic energy creature . When Sarah reaches the pit , she sees the Doctor climbing out , half delirious and falling in and out of consciousness . Vishinsky spots them on the tracker ' s signal and goes to get them , despite Salamar ' s protests . In his quarters , Sorenson records his observations on the ore ' s increase in flux activity , but something is obviously affecting him . He doubles over in pain , and his eyes glow red . He quickly quaffs a solution from a flask and returns to normal . The Doctor is placed in the ship ' s sickbay . When he awakens , the ship is taking off , but Sarah assures him that the samples have been jettisoned . The Doctor relaxes . He had given his word as a Time Lord to whatever was in the pit . The ship ' s systems start to fail as before , however , and the Doctor realises he still has some antimatter ore in the toffee tin , which he used to survive the pit . Morelli is given the tin to jettison it , but as he turns a corner , he is attacked and drained . The ship has reached free space , but drag is still increasing . The Doctor deduce s that there must be antimatter still aboard . A feral Sorenson drinks another dose of his infusion and returns to normal . Examining the body in the sickbay , Vishinsky discovers that Morelli was killed the same way , even though the creature could not have gotten on board through the force field . Vishinsky ejects Morelli ' s body into space . On Sorenson ' s advice , Salamar goes to the sickbay and accuses the Doctor again of causing the deaths . He demands they open up the TARDIS or be shot . The ship is not making any headway . It hangs suspended in space despite the thrusters going at full power . The Doctor tells them they have reached the end of their elastic ; it will stretch no further . In the sickbay , Sarah sees Sorenson double over in pain again . She starts to experience the same sensations she did on Zeta Minor . By the time she recovers , Sorenson is gone . Sarah hears De Haan ' s dying screams and goes to investigate , crying out when she sees something feeding on the crewman . Her cry distracts Salamar long enough for the Doctor to punch him and leave the quarantine area . The Doctor reaches Sarah , who describes what she saw , a hybrid creature the Doctor dubs " Anti - Man " . Salamar , recovered from the blow , finds the Doctor and Sarah over De Haan ' s shrivelled body . Before the Doctor can explain , Salamar shoots him and orders them taken to the ejector chamber . In his quarters , Sorenson takes another dose of the formula but can no longer hold off the transformation . He collapses onto his bed , eyes aglow . The Doctor and Sarah are strapped to the ejector trays . Vishinsky protests they have no evidence to execute them like this . He refuses to obey Salamar ' s order . In the struggle between the two men , however , the ejection lever is thrown . . . Part 4 . Reig , a crewman on the command deck , cries for help over the ship ' s intercom as he is attacked . Salamar and his men rush out of the sickbay , allowing Vishinsky to reverse the ejector control before he too leaves . They find Reig dead in the same way . Salamar still rants that the Doctor caused this , but Vishinsky snaps back that they were with them when Reig ' s death took place . Vishinsky gives the order for a red alert ; he is relieving Salamar of command . Sarah helps the Doctor out of the ejector trays and tells him about what she felt before De Haan was killed . When the Doctor learns she was with Sorenson when that happened , he realises the professor has been infected with antimatter . His brain cells are being destroyed , and he is descending to a brutish mental level , creating Anti - Man . He tells Sarah to pass the message to the command deck to seal the hatches and keep Anti - Man isolated . As the Doctor goes deeper into the ship , the section hatchways close . He uses the sonic screwdriver to enter Sorensen ' s quarters , finding the canister of antimatter ore . He also finds the bottle of Sorenson ' s solution and that the liquid reacts with the antimatter . Sorenson , again normal , enters the room . The Doctor tells him that the solution — an oral vaccine Sorenson believes will protect him against anti - quark penetration — did protect him for a time . However , it set up a cycle of chemical change , hybridising his tissues to the point where the next change could be the last . He reminds Sorenson that , as scientists , they buy their privilege to experiment at the cost of total responsibility . He hands Sorenson the canister ; he knows what he must do . On the command deck , Salamar has taken the ship ' s neutron accelerator . He intends to expose Sorensen to its radiation , even if it kills them both . Raving , he forces Vishinsky to open the hatch at gunpoint and goes off to hunt Sorenson . In the meantime , Sorenson is on his way to the ejection chamber , intending to jettison the antimatter and himself . Unfortunately , he transforms into Anti - Man again before he can throw the lever . The Doctor finds the chamber empty and the canister abandoned . The ship continues to accelerate towards Zeta Minor ; there are now two sources of antimatter , the other being Sorensen himself . When the Doctor finds that Salamar is hunting Sorensen with a neutron accelerator , he goes to stop him , telling Vishinsky to keep the hatches open . He is too late . Salamar has found Sorenson and opened the accelerator ' s shield . Anti - Man drains Salamar , but the radiation boosts his power . After finding Salamar ' s body , the Doctor finds himself faced with multiple , semi - transparent Anti - Men like the creature on the planet , which he dispels by waving the canister of antimatter at them . He reaches the command deck and tells Vishinsky that Sorensen has multiplied . Even with the hatches resealed , the Anti - Men burn their way through . The intercom is filled with the screams of dying men . The ship is fifteen minutes from impact . The Doctor takes a pistol and leaves the command deck . He works his way past more Anti - Men until he finds the Sorenson Anti - Man , whom he stuns with the pistol and takes into the TARDIS . He pilots the time ship down to Sector 5 on Zeta Minor as the Anti - Men start burning though to the command deck . The TARDIS lands in Sector 5 . The Doctor and Anti - Man are locked in a struggle on the edge of the pit . Anti - Man loses his footing and falls in , and the Doctor throws the canister after him . On the ship , the other Anti - Men fade out of existence and the ship begins to pull away from Zeta Minor . Unexpectedly , the Doctor finds Sorenson , restored to human form , at the edge of the pit . He takes the professor into the TARDIS , and it dematerialises just as the creature rises from the pit . Because the Doctor kept his word , Sorenson was released . The Doctor returns to the ship for Sarah , but before they leave , the Doctor tells the still - suggestible Sorenson that he abandoned his anti - quark research for a source of energy derived from the kinetic forces of planetary movement . Sarah hugs Vishinsky good - bye . The Doctor notes they have an appointment in London , and they ' re already thirty thousand years late . In space , the TARDIS spins away to its next destination . . . DVD , video and other releases . DVD releases . Contents : Notes :