Secrets of the Stars ( TV story ) Secrets of the Stars is the third serial in Series 2 of " The Sarah Jane Adventures " . It explored the origins of the Zodiac calendar and the mystical connections to it . Notably a first , the antagonist used precognitive abilities to discern extraordinarily accurate knowledge of Sarah ' s past within moments of meeting her , including things he should not know by normal means , such as her travels with the Doctor , something that she would only reveal to her closest friends . There was also a brief flashback to her reunion with the Tenth Doctor , his first appearance within the narratives of " The Sarah Jane Adventures " . Synopsis . Astrologer Martin Trueman causes a stir with his uncanny insights and predictions . Sarah doesn ' t believe in astrology , but she does believe that all is not as it seems with Trueman . Around her , people are falling under Trueman ' s sinister spell and even Mr Smith doesn ' t understand what ' s going on . Plot . Part 1 . A young woman , Cheryl , is paying a regular visit to her astrologer , Martin Trueman . When she confides that she is spending her mortgage money to see him , Trueman breaks down and confesses that he is a con artist . As he stands by his window , unable to face her , he is hit by a shooting star . Suddenly , he ' s found a renewed belief in astrology . Some time later , Rani and her mum have dragged Mr Chandra , Luke and Clyde to Martin Trueman ' s astrology seminar at East Acton New Theatre . Sarah has come , too , thinking she might do a story on Mr Trueman . Before entering the auditorium , each of them fills out a card with his or her birthday and gives it to Cheryl , who is now working as Mr Trueman ' s assistant . Luke , who was not really " born " , does not have a birthdate , a fact that troubles him . Mr Trueman begins his show by naming a random date and asking those born on that date to stand . Clyde stands , despite his stated intention not to ; he is unnerved , but Sarah reassures him that it ' s a trick of persuasion . Mr Trueman selects another audience member . To the audience ' s astonishment , he divines her life story . Sarah can just convince her friends — and herself — that Trueman is just using cold reading techniques . Then Trueman selects her . He reveals an impossible amount of knowledge about seemingly ordinary Sarah ' s extraordinary travels and more importantly , about the Doctor . Stunned and intrigued , Sarah stays after the show to talk to Trueman alone . She demands to know the source of his uncanny knowledge . He insists that astrology alone is responsible for his success . When he concludes the interview by warning Sarah against opposing him , she has no choice but to leave , as baffled and as unnerved as when she met him . On the way home Clyde encounters Trueman , who hypnotises him to walk to his house and hypnotises him to become his slave . In his trance Clyde suddenly seems to gain a new sense of purpose and direction , and sets off to meet Sarah and Luke back at 13 Bannerman Road . . . where he threatens to kill them , while Mr Smith stands idly by and insists that " nothing is happening " . Clyde ' s hand glows with lethal energy and he points it at Sarah , declaring that she must be destroyed . Part 2 . Sarah and Luke talk Clyde out of threatening them , a feat Sarah attributes to Clyde ' s intrinsic goodness overriding any hypnotic techniques Trueman may have used . The friends continue their discussion of Trueman . Mr Smith gives them background on astrology : a belief system widespread throughout the galaxy , he says and , in his opinion , mere superstition . It is a physical impossibility for " imaginary patterns in the sky " to affect reality , as the computer puts it . Luke theorises that , if that is the case , maybe the Ancient Lights Trueman speaks of are from " another " universe . . . the one that existed before Event One . Mr Smith interrupts the theorising to patch through a television programme . Mr Trueman has taken over the airwaves and broadcast one of his astrology talks . This lecture / demonstration features a large , twelve - pointed star , each arm marked with a different sun sign . Trueman lights up the points of the star one by one , giving him control over people born under that sign . He begins with those born under the sign of Gemini , a group that includes Rani ' s mum . The investigators return to the theatre to stop the broadcast , but the possessed Children of Gemini threaten to stop them . Clyde bluffs his way through by making up horoscopes . The Ancient Lights create a portal to the theatre . Trueman reveals that Luke ' s theory on the Ancient Lights is true : in the previous universe , he claims , they controlled all lifeforms . The Ancient Lights survived the Big Bang and needed Martin Trueman to rule the world because he was the " Chosen One " . Sarah tries to talk him out of it , but he will not listen . Rani and Luke try to shut down the broadcast by flicking the mains switch off , but the Ancient Lights protect it with a force field . As they struggle to find a way through , Trueman ' s wheel reaches the sign of Aries , and Rani , an Aries , comes under Trueman ' s control . Of the twelve sun signs on Trueman ' s wheel , only Taurus now remains . Sarah is a Taurus , but cannot think of what she and Luke can do with only seconds remaining before she , too , falls under Trueman ' s control . Luke has an idea : since he was " not " born , he theorises , he doesn ' t " have " a star sign . He won ' t be under Trueman ' s control under any circumstances . . . so he is the only person able to destroy Trueman ' s wheel . Doing so severs the connection with the Ancient Lights and prevents their entry into the universe . Sarah pleads with Trueman to leave the theatre and escape with them , but Trueman refuses ; he cannot bear to return to his former life and chooses to become " one with the stars " disintegrating into space . As the friends celebrate back at Sarah ' s house , the clueless Earth authorities begin what the investigators know will be a fruitless search for Trueman . Luke and Sarah decide that , since Luke was able to use his lack of a birthday to save the universe , they will take today ' s date as his own equivalent of a birthday .