Across the Darkened City ( audio story ) Publisher ' s summary . On the planet Shade , The Chaon s , an invading race of strange , amorphous creatures that ravenously absorb energy , have reduced the city there to a desolate ruin . Separated from the First Doctor and Vicki , Steven has to join forces with an unexpected ally to find his way back to the TARDIS . Ahead , lies a nightmare journey through the dark - a test of endurance and trust . Plot . Journey into Night ( 1 ) . Steven is among a group of prisoner s held captive by the Dalek s , separated from the Doctor and Vicki on Entropica after a failed attack . Despite Steven ' s protest , one woman is killed for being too weak to work . The rest are scanned prior to robotisation . A prisoner revolt instigated by Steven and Mette sends the ship crashing on the planet Shade . One Dalek is damaged and so the other two destroy it because of its " deformity " . One of them then proceeds to exterminate all of the prisoners , but is itself destroyed by the last Dalek , Genetic Variant Two - One - Zero , before it can kill Steven . Steven and Two - One - Zero are the only survivors and their only hope of escaping the planet is a transmat left by the Daleks on a previous invasion . Two - One - Zero knows the codes which can return him to Skaro , but with his drive units disabled in the crash , he needs Steven ' s help to traverse the ruins of the dark , vast city , which is swarming with vicious Chaon s . Steven loads Two - One - Zero onto a cart which he can pull , but the damage wrought by the Dalek and Chaon invasions has left many roads impassible . They travel through a warehouse occupied by a Chaon to bypass one obstacle . At another , it begins to rain . A bolt of lightning strikes Two - One - Zero , leaving him immobile and unresponsive . Steven knows that without him , he will be trapped on the planet . The Chaons ( 2 ) . Two - One - Zero revives , using the charge from the lightning to repair some of his systems . As they continue into a street of buildings full of Chaons , Two - One - Zero instructs Steven to turn off his torch , ostensibly to save its charge or not to attract Chaons . However , Steven is able to make out in the darkness a mass grave of Shade ' s inhabitants slaughtered by the Daleks . He realises this is the real reason he was ordered to turn the torch off . Disgusted and furious , Steven threatens to destroy Two - One - Zero with a magnobomb he salvaged from the ship , but Two - One - Zero returns a warning shot with his gunstick . He claims he is " better " than other Daleks , and Steven calms himself down . As Chaons catch up with them , Two - One - Zero abandons his casing , which the Chaons devour . Steven carries the mutant and its translator device in a tarpaulin across a body of water and into the transmat station . Without life support , Two - One - Zero is dying . He pleads to be sent back to Skaro , instructing Steven how to work the dais . Steven demands Two - One - Zero stick by the terms of their deal and give him the code for Entropica first . When a Chaon attacks , Steven places the mutant into a disused Dalek casing left in the station . It fights off the Chaon . Then he betrays Steven . Steven seeks cover behind the controls , knowing the Dalek wouldn ' t dare risk firing on them , and demands the code for Entropica . Two - One - Zero gives the code as 02943764 and Steven actives the control before he is fired upon . As more Chaons arrive , Steven receives contact from the Doctor , who gives him the code for Entropica . Steven notes it is different from the one the Dalek gave him . Quickly inputting the correct code before the Chaons devour him , Steven returns to Entropica and arrives at the TARDIS where he is reunited with the Doctor and Vicki , his real friends . Epilogue . Despite almost being destroyed for returning to Skaro in a different casing , making him difficult to identify , Two - One - Zero is the only surviving Genetic Variant . As such , he is declared the superior Dalek and is placed in the emergency container . He then declares himself Dalek Emperor and , intrigued by Steven ' s behaviour , orders that the Daleks ' prime directive is to discover the Human Factor so that their enemies can one day be crushed and the universe conquered .