Jeff Stone Jeffrey " Jeff " Stone ( COMIC : " The Humanoids " ) was a mineralogist who hailed from New Paris , Venus . ( COMIC : " Invasion of the Daleks " ) The dark - haired — even slightly greying — elder brother ( PROSE : " Break - through ! " ) of blondes Andy and Mary Stone , his life was forever altered by the Dalek invasion of his homeworld . He became one of the Skaran mutants ' most noteworthy human opponents . Biography . Venusian life . Little was known about Stone ' s life before the Dalek invasion of Venus . However , it was likely during his pre - Dalek life that he made a study of the Horrorkon s , massive two - headed beasts native to the planet of Gurnian . ( COMIC : " Monsters of Gurnian " ) Stone ' s involvement with the Daleks began when he was on holiday with his siblings in the Churchill Mountains . The Daleks attacked Venus and almost immediately captured him . ( COMIC : " Invasion of the Daleks " ) Recognising that his skills as a mineralogist made him smarter than the average human slave , the Daleks forced him to work in a lab at a lead mine . Andy came to free him , but it was really Jeff ' s knowledge of the properties of lead azide which destroyed his local Dalek masters . The two then set out to find and free their sister . ( PROSE : " Red for Danger " ) Following a lead , they went to one of Venus ' oil wells . The two devised a plan to disrupt the Daleks ' authority over the well , now turned into a kind of concentration camp . Their plan succeeded , and they freed all the humans at the camp , but Mary had by this time been moved to Dalek headquarters at New Paris . ( COMIC : " The Oil Well " ) On the way to find her , Jeff noticed something odd about the height of the Churchill Mountains . He supposed that the Daleks had built a new base atop one of the peaks . The Stone brothers then made contact with Vel Karneen , who was likely the first person in any sort of organised armed force that Jeff encountered . Using one of Karneen ' s copterjet s , the Stones ascended the mountain peak and snuck into the Dalek base . Inside , they found their sister and a lot of enslsaved Venusian s . Using only a metal button from his clothing , he fried the internal electrical system of the Dalek base . This freed all the Venusians , and forced the Dalek fleet to flee their new headquarters . Jeff was able to radio Karneen for help which gave the humans the advantage . The Space Army fleet simply downed each Dalek ship as it emerged from the mountain hideaway . The entire Dalek fleet occupying Venus was destroyed . Thus , it could be fairly said that Jeff Stone freed his homeworld with a single button — and a little help from the Space Army . ( PROSE : " The Secret of the Mountain " ) Further afield . Following Venus ' liberation , Jeff became part of a human force that pressed the offensive against the would - be invaders of the Solar System . He had many adventures on various different worlds in service to the Space Army , and its successor , the Space Security Service . Skaro . One of his first missions was a reconnaissance flight to Skaro itself . He may well have been the first human to gather detailed information about Dalek society , culture and technology . He brought back a full schematic of the typical Dalek , providing human scientists with valuable insights into Dalek weaknesses . He also discovered that Daleks had agents that looked exactly like humans . These " Dalek humanoids " posed a serious security problem for humans . ( COMIC : " City of the Daleks " ) Mars . Later , on Mars , Jeff and his siblings encountered these " Dalek humanoids " . They were part of a Dalek " advanced guard " , preparing the way for a full - fledged Dalek invasion . The Stones uncovered the fact that they were humanoids just in time to destroy the Dalek invaders , who incorrectly believed that Mars had been secured by their humanoids . Unfortunately , the Stones were not able to stop the humanoids from destroying the spectroscanner that Andy had rigged to detect Dalekenium . This left the family open , Mary joked , to a massive replacement charge . ( COMIC : " The Humanoids " ) Pluto . On Pluto , he discovered a way to use the sun ' s rays to blind , then disarm , the Daleks . ( PROSE : " Break - through ! " ) Earth . On Earth , Stone once witnessed the destruction a mole wrought on the Daleks ' plans to create a metal landing pad in Kent for a larger invasion force . ( PROSE : " The Small Defender " ) During one particular assault , he was elected Earth ' s Chief of Defences , and successfully mobilised all the Earth ' s nations against a Dalek incursion which all other human leaders had deemed a lost cause . Unnamed planets . On one world , Stone once led an underwater exploration . He and his team unexpectedly found a thousand - year - old Dalesub at the bottom of an ocean . After repairing it , they took into battle with a Dalek group — and defeated them easily . ( COMIC : " The Super Sub " ) Behind the scenes . Though many remember the Dalek annual s of the 1960s as the home of additional stories about Sara Kingdom , in fact the most - used character of the three volumes was Jeff Stone .