Sky Smith

Sky Smith was created by Miss Myers, a member of a Fleshkind race, as a weapon intended to exterminate the Metalkind. She was later adopted by Sarah Jane Smith. She shared a similarity with Sarah Jane's son Luke Smith in that while she had the physical appearance of a pre-teen, she was actually a "newborn."

Creation
The Fleshkind and Metalkind had been at war for centuries before "Sky" was born. Sky was created in 2011 by Miss Myers (essentially her mother) as a superweapon that could destroy every single Metalkind across the entire Universe. She had to be primed to detonate which involved her being in vicinity of at least one Metalkind, she would then explode, inevitably ending her life. (SJA: Sky)

Meeting Sarah Jane
Before this could happen however, she was taken to Earth by the Shopkeeper and Captain and dropped of at Sarah Jane's house where the Shopkeeper believed she would be safest. She began to blow out all of the electricity in Bannerman Road and Sarah Jane named her Sky because it seemed like she had "fallen out of it". She was primed when she was in vicinity of a Metalkind, she became a pre-teen. She decided that she had to fulfil her destiny to wipe out the Metalkind before Miss Myers could summon them to Earth and slaughter the blue planet. Luckily however, Clyde Langer and Rani Chandra prevented the Metalkind from appearing and the lone Metalkind teleported himself and Miss Myers away from Earth back to the war. (SJA: Sky)

Part of the Gang
Sky met the Shopkeeper again in Sarah Jane's attic who confirmed it was him who dropped her off at Sarah Jane's, Sky wanted to stay with Sarah Jane and the Shopkeeper agreed and then with the Captain teleported away, "Sky Smith" had become Sarah Jane's daughter. (SJA: Sky)

Less than a month later, Sky was enrolled in Park Vale Comprehensive School while she and Sarah Jane were being interviewed by Haresh Chandra it began to rain fish. Due to her non-human nature, Sky was the only person who did not fall victim to the curse put on Clyde by Hetocumtek. She confronted Sarah Jane, Rani and Carla Langer and deduced that Hetocumtek was using Clyde's name to escape from his totem pole. After consulting Mr Smith for advice, she urged Sarah Jane and Rani to break the curse on themselves by saying Clyde's name and remembering what he meant to them. They found Clyde and took him back to Bannerman Road where Mr Smith teleported the totem pole into into the attic. Clyde defeated Hetocumtek by shouting his name at the totem pole, the curse was lifted and the totem pole destroyed. (SJA: The Curse of Clyde Langer)

As one of the top three journalists in the United Kingdom, Sarah Jane was invited to the rehearsal of the launch of the SerfBoard by Joseph Serf. She took Sky and Luke who had just come back from university. She met her old editor Lionel, and continued to amiably reject his romantic advances. Luke and Sky noticed something was wrong with Mr Serf, he glitched. Sarah Jane found out through Mr Smith that the real Serf had died in a skiing accident in 2007. She organised an interview with the hologram Serf but his associate John Harrison stayed with them. Sarah Jane made numerous attempts to expose Serf before finally getting him when he tried to hypnotise her. Harrison drew an alien weapon and threatened Sarah Jane. Serf was being controlled by Skullion slaves of Harrison, Luke and Sky had discovered this and took control of Serf to distract Harrison. Harrison wanted to hypnotise the entire planet via Serf so her could make billions in profit when everyone bought the SerfBoard, he then took Sarah Jane's sonic lipstick and locked her in a room with a cleaner and Luke and Sky in another her in another.

Another prisoner with Sarah Jane was Adriana Petrescu, a cleaner who wanted to help the Skullions. They manage to escape and free Luke and Sky who had used K9's whistle to alert Clyde and Rani via Mr Smith to get the pen, Harrison was using to torture the Skullions. Clyde and Rani arrived at the launch in disguise and managed to retrieve Harrison's pen. Luke and Sky took control of Serf whilst Sarah Jane and Adriana took the Skullions to the roof of the building. Mr Smith had alerted the Skullion species to send a spaceship to Earth to pick up the Skullions. Harrison took his pen back and began to kill the Skullions, fortunately, Luke and Sky used Serf to hypnotise the audience at the launch to destroy Harrison's pen which they did. He told Clyde and Rani to go to the roof where a Skullion spaceship appeared and took the freed Skullions home. Harrison had also been beamed up by the Skullion spaceship, where Luke hoped that the Skullions would put him to work. Sarah Jane gave Adriana a card for U.N.I.T saying that Adriana was just what they needed and she would ensure that Adriana was paid well. Sarah Jane and her gang then returned home. Sky was treated to a picture of herself drawn by Clyde and stuck up by Luke, she then embraced her brother. (SJA: The Man Who Never Was)

Later Life
Sarah Jane and her gang continued to have adventures, defend Earth and save countless lives. Statues would be raised in their honour and they would leave behind a legacy that would last forever. (SJAN: The Wedding of Sarah Jane Smith (novelisation), SJA: The Man Who Never Was)

Personality
Upon her transformation or "priming", Sky was very similar to Sarah Jane's first adoptive child, Luke. She knew nothing of the world, a similarity Rani noted early on. Because of her naïvete she asked many questions; wanting to know more about Earth, which she loved. (SJA: Sky, The Curse of Clyde Langer)

She enjoyed Clyde's jokes more than Sarah Jane and Rani and was was very joyful. However she was quite defiant and very brave, ignoring the Bannerman Road gang's protests both when she was willing to die in order to save Earth- and specifically, to save Sarah Jane with whom she had quickly developed a bond- shortly after her birth, and when she was the only person immune to the curse on Clyde's name despite Sarah and Rani both protesting that they didn't want to hear about Clyde again. (SJA: Sky, The Curse of Clyde Langer)

Sky was nervous about meeting Luke and was initially jealous of him, but quickly she grew to love her brother as he did her. Unlike Luke she did not call Sarah Jane "mum". (SJA: The Man Who Never Was)

Abilities
Sky was created as a bomb to wipe the entire Metalkind species from existence. Miss Myers compared the girl's power to the fury of a supernova. Sky could make electrical devices activate, malfunction or explode by laughing or crying. She exuded an orange aura and could shoot powerful electrical pulses from her hands. These powers were apparently nullified after she absorbed the energy of a power station, though some of her influence over electrical devices remained, albeit more controlled. (SJA: Sky) She was immune to the effects of the curse placed on Clyde Langer due to her not being a conventional human. (SJA: The Curse of Clyde Langer)