The Trickster The Trickster was an immortal extra - dimensional alien , formerly part of an extra - dimensional group of beings known as the Pantheon of Discord , who were banished from the known universe . The Trickster , alone , frequently manifested on Earth , making bargains to alter history in attempts to draw power from the chaos he created and thus enter the world in his full power . Biography . Not much was known about the Trickster ' s origin , other than it was affiliated with the group known as the Pantheon of Discord . All that was recorded was his attempts to influence history . Legends of the Trickster and the Pantheon were known to the Time Lord s . ( TV : " The Wedding of Sarah Jane Smith " ) At some point , the Trickster learned that the Graske Krislok was destined to die , and set about trying to prevent this . Projecting an image of himself into Krislok ' s spacecraft , mere moments before it was about to burn up , the Trickster offered to save Krislok from death if he gave him his consent . Krislok agreed , and the Trickster rescued him . In exchange for saving him , the Trickster forced Krislok to become his slave . ( TV : " The Temptation of Sarah Jane Smith " ) First attack . Later on , to satisfy his need for chaos , the Trickster found an event in 2008 , which would have caused destruction on Earth and wiped out human ity , who would otherwise become a major species in the universe . This event was a meteorite crashing into the Earth , undetected by military radar . ( TV : " Whatever Happened to Sarah Jane ? " ) There were many other times when life on Earth would have been threatened by alien life , ( TV : " Invasion of the Bane " , " Revenge of the Slitheen " , " Eye of the Gorgon " , et al ) but the meteorite crash was one of the few with no purpose , the result of pure chance . This would ultimately give the Trickster the opportunity to consume the resulting chaos , and manifest himself in reality in full power . ( TV : " Whatever Happened to Sarah Jane ? " ) In the original timeline , the impact would have been stopped by Sarah Jane Smith and Mr Smith . The Trickster removed Sarah Jane Smith from Earth ' s timeline , influencing events so she died in the place of Andrea Yates ( who should have died in the original timeline ) in 1964 . The Trickster also forced the alien s that Sarah Jane would have faced to leave the Earth alone . As a result , Luke Smith , Sarah Jane ' s adopted son , was never born because the Bane never invaded Earth . However , all did not go to plan . When removing Sarah Jane from history , Maria Jackson held an alien puzzle box , protecting her from the effects and allowing her to remember the original timeline . She reminded Andrea Yates of the day Sarah Jane died , causing Andrea trauma . The Trickster sent his Graske servant Krislok to remove Maria from history . However her father found and held the cube with Andrea ' s consent , allowing him to remember the events . In turn , he reminded Andrea of Maria , again causing her distress . The Trickster sent Krislok after Alan , but he foiled the plan and trapped the Graske . Alan found a device on Krislok which summoned Maria back to existence from Limbo , and they went to Sarah Jane ' s house ( in this time line , Andrea ' s house ) where Sarah Jane appeared in a mirror . She explained that while Andrea was alive , Sarah Jane couldn ' t be . Andrea , realising that she had to die ( either by falling off a pier in 1964 or in the soon - to - be meteorite crash ) , repudiated her deal with the Trickster . The timeline returned to normal , Sarah Jane and Mr Smith deflected the incoming meteorite and the Trickster was defeated . Through Sarah Jane ' s memories , the Trickster also learned of the existence of the Doctor and planned on using Sarah Jane to remove him from time , which would have resulted in an untold amount of chaos . ( TV : " Whatever Happened to Sarah Jane ? " ) Revenge . The Trickster decided to get revenge on Sarah Jane . He opened a time portal to 1951 , where she went to meet her parents , whom she did not remember . Sarah Jane and Luke deactivated her father ' s car , saving her parents from death . By preventing a fixed event in history , the Trickster was able to physically manifest on Earth in nearby sacred ground , creating an alternate time line in which the Earth was drained of its life by the Trickster , and his Graske , Krislok , had enslaved mankind , forcing them to mine for minerals to give the Trickster power to escape into space and enslave other planets . However , Rani Chandra travelled back and warned Sarah Jane of the Trickster ' s plan , and her parents sacrificed themselves to correct the time line . ( TV : " The Temptation of Sarah Jane Smith " ) An uninvited wedding guest . When Peter Dalton fell down the stairs at home and was about to die , the Trickster — clad in white as opposed to his usual black — appeared to him and asked for his agreement . If he agreed , he would survive but would have to get Sarah Jane to marry him , which he did . However , the wedding was disrupted by the sudden arrival of the Tenth Doctor , who had learned of the Trickster ' s plan and demanded the wedding be stopped . At this point , the Trickster trapped them in two time loop s , with Peter and Sarah Jane in one and the Doctor , Luke , Clyde , Rani and K9 in another . If Sarah Jane did not agree to the wedding , they would all be trapped forever . If married , Sarah Jane would stop fighting aliens , and chaos would ensue . The Doctor ' s TARDIS tried to get into the time loop , and the Doctor was able to get inside , but the TARDIS was pulled out of the loop before the others could be saved . When Clyde absorbed artron energy from the leaving TARDIS , he attacked the Trickster , weakening them both . He and Clyde were sent back in the reception room as the Doctor arrived . When Peter learned the full story and the consequences of his action , he repudiated his deal and threw his ring at the Trickster , banishing him . ( TV : " The Wedding of Sarah Jane Smith " ) Personality . The Trickster was an enigmatic and sinister creature that was perpetually hungry for chaos , which he reveals to be what provides him with energy . He was highly intelligent and manipulative , capable of influencing anyone with words . He was arrogant , thinking himself as superior to all beings and taking all other life forms for granted . This proved to be his weakness every time he faced Sarah Jane Smith : He was incapable of understanding , or even considering , the full extent of human emotion - he only preyed on the human instinct to live , which is shown when he always meets his victims and tries to manipulate them on the point of death . Abilities . The Trickster was an incredibly powerful creature . He fed on chaos and acted to increase random chaos . He had less interest in the chaos created by intelligent beings , preferring the chaos of natural disasters . ( TV : " Whatever Happened to Sarah Jane ? " ) The Trickster was also extremely manipulative : He had power over people ' s timelines , but only with their consent . He tended to go after the dying , giving them life in return for servitude . People and things removed from the timeline by his alterations would find themselves trapped in limbo . ( TV : " Whatever Happened to Sarah Jane ? " , " The Temptation of Sarah Jane Smith " , " The Wedding of Sarah Jane Smith " ) He was vulnerable to artron energy , which The Doctor described as " equal and opposite of the Trickster ' s power " . ( TV : " The Wedding of Sarah Jane Smith " ) Appearance . The Trickster had a humanoid form , but with sharp teeth and an otherwise featureless face . The Trickster normally wore a long black hooded robe and gloves , covering his entire body apart from his face . ( TV : " Whatever Happened to Sarah Jane ? " , " The Temptation of Sarah Jane Smith " ) Whether this was his true form or an attempt to cause fear is unknown . ( WC : " The Alien Files " ) When he appeared to Peter Dalton under the pretence that he was a benevolent angel there to help , he wore the same outfit , but the colour was entirely changed to white ; resuming his more customary black only while apart from Peter and Sarah Jane . ( TV : " The Wedding of Sarah Jane Smith " ) Other influences . There were other members of the Trickster ' s Brigade . One was a beetle - like creature which created a parallel world around Donna Noble in which the Tenth Doctor died . This resulted in much chaos due to alien attacks and incursions on Earth not being thwarted . ( TV : " Turn Left " ) Others organised a plot involving a Brainspawn driving future American President Franklin Delano Roosevelt insane , causing him to drop America out of World War II resulting in Nazi Germany winning the war . This plan was foiled by Jack Harkness and Angelo Colasanto . ( TV : " Immortal Sins " ) Other information . When cyborg hacker Psi was attempting to protect Clara Oswald from the Teller , he ensured that it would focus on his guilt by uploading the memories of some of the worst criminals in history , one of them being the Trickster . ( TV : " Time Heist " )