The Ghost Planet " Captain Kirk and Mr . Spock save a planet from extinction , but are doomed by its war - mad leaders ! Tricked ! " Summary . Captain Kirk orders the ship taken into the phenomenon , revealed to be a magnetic effect occurring from a concentration of copper material by Mr . Spock ' s spectroscopic analysis . When Kirk orders the ship ' s rocket s employed , Spock warns the magnetic field may cause turbulence , and Kirk orders the crew to secure their seatbelt s and to rig the stabilizers for extreme pressure . The ship penetrates the cloud to a depth of two lunar miles , and detects a planet to starboard as the vessel clears the phenomenon . Spock detects radioactivity impulses coming from the planet , but cannot pinpoint it . He suggests a reconnoiter , but Kirk decides that they should beam down to the surface of the ghost planet . They discover a city in ruins . Spock suggests that it seems to be due to the result of a bombing from a war . A voice echoes out to welcome them and tell them that transportation is en route . Sure enough , a robot controlled vehicle arrives , and Kirk tells the other members of the landing party to keep their phaser s ready . The vehicles takes them through the city to a building , and a robot motions them inside and tells them to take their seats . A giant screen shows the image of two humanoid s , appearing to be identical twins . They introduce themselves , " " We are the Twin Supremes of Planet Numero Uno ! I am Justin ! " " , " " And " I " am Justin ! We rule together ! " " Kirk introduces himself and tells them to identify themselves properly or he will leave . Justin One apologizes and begins to tell the story of their planet . A lunar sun before , the " Terror " came upon their planet , enveloping them in the rainbow rings . The emitted radiation that began to kill off the population . This drove them from their home planet as they built two satellites , and a successful exodus from the planet ' s surface took place . Soon enough , the stations were over - populated , and there were no longer the means to build more stations or weapons to destroy the rings . The Justins ask Kirk and Spock to help them . Spock speculates that laser beams would shatter the rings , but the contaminated matter would still orbit the planet , and thus a magnetic pull might solve the problem . After the Justins sign off , promising to contact them in a lunar hour , Spock seems troubled that they built two satellites . Before he can continue , one of the security crewmen interrupts them to show them something . Robot guards are all over the complex , but wo are unfriendly , and when they try to enter a door , the robots grab one of the crewmen . The crew cannot shoot the robots for fear of hitting their man , but Spock asks Kirk for his communications transistor , and Denton , the other officer , to splash water from his canteen at the feet of the robots . They do so , and the robots are electrified , saving their man . With the robots disabled , they enter the room and find what appears to be the Unoite War Room . After rummaging through files , they come across photographs showing that Justin I and Justin II were fighting each other , and almost 500 , 000 were dead because of it . The Justins are not as peaceful as they made themselves out to be . When the lunar hour is up , the crew go back to the viewer , they agree to meet in an hour , on the starship . The two Justins fly over in separate ships , and Kirk opens the airlocks for them . When they enter the room , Kirk accuses them of deceiving him and shows him the photographs as proof . The two men immediately go for their weapons , but Spock shoots them out of their hands . Kirk learns that they were fighting for supremacy of the planet and the rings forced them to work together . He tells of their job to bring peace to the galaxies , and that they believe it best to let this civilization die out . The Justins insist that they have no weapons and that visual detectors can be left in place to observe them from space for years . If they begin to build weapons , time devices left can destroy them . Spock and Kirk send the Justins back to their satellites to consider the problem at hand . After some thought , Spock suggests using the magnetic generators to make a crack in one section of the rings , and hopefully pull the doom rings through that crack into space . Unfortunately , the power of the ship isn ' t enough , but they fire electronic " rifles " at the magnetic field of the twin satellites and suck in the fields , getting enough strength to break through . The material of the rings rushes toward the " Enterprise " at the speed of sound , and Spock cuts the power . As he does so , they rush into deep space and mysterious solar actions bursts them all . Kirk tells the Justins the good news , and tells them that they will need to test the surface for radiation before anyone can return . When they beam down , Spock ' s Geiger counter detects atomic radiation coming from a nearby hill . They head toward a cave and discover an enormous cache of weapons , separated into two piles , one belonging to Justin I , the other to Justin II . Meanwhile , the Justins have been tele - screening the crew ' s actions and send space fighters down that fire on the landing party . The ships land and the aliens surround the crew . Kirk calls up to Dr . McCoy to transport them up , but it seems to be jammed . Spock quickly tells Kirk to stall the aliens while he contacts the " Enterprise " . After a moment , he leaps up and tells them that if they kill the crew , they will be killing themselves . He points to the sky , and the rainbow bands have returned . The Justins drop their weapons and raise their hands over their heads . Kirk and Spock destroy the space planes and the weapons before returning to their starship . Spock tells Kirk that he had McCoy play films of the bands back into their atmosphere , fooling the Justins with a reflection in the sky , thus saving the civilization from destroying themselves . Memorable quotes . " " Our magnetic pull has smashed the deadly rainbow bands , Captain Kirk ! " " " " Yes , Mr . Spock ! But cut power before those bands reach us of they ' ll " penetrate " the " Enterprise " ! " " " " The visitors appear to have " freed " our planet . . . and if so they must " die " ! " " " " It ' s working Mr . Spock ! We ' re sucking in the magnetic fields ! " " " " Great space ghosts ! They cached their weapons for future use ! " " " " Now ! Either drop your guns or fire ! If we die your entire civilization perishes ! " " " " No . . . no ! You may go free ! Just take your deadly bands with you ! " "