Last updated 28 March 2020

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

The Fleshkind and Metalkind had been at war for centuries before "Sky" was born. Sky was created 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.

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". While Sarah Jane was busy looking for where she came from, Sky was taken care of by Clyde until a member of Metalkind arrived. She found baby Sky outside her doorstep. Sky was captured by her "mother" and brought to the power plant, where the Metalkind approached her and triggered her prime transformation into a preadolescent.

Being taken from the plant, Sky was brought back to Bannerman Road, where Mr Smith told her that she was a bomb meant to destroy the Metalkind and that only Miss Myers could defuse the explosion she was genetically programmed for. As Miss Myers was bringing Metalkind to earth in an attempt to force Sarah Jane to give her up, Sky decided to fulfil her destiny and go to the Metalkind world before Miss Myers could succeed. 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. Due to the discharge of energy when the portal was closed, Sky's bomb status was wiped and she was brought back to Bannerman Road, where she was introduced as Sarah Jane's new daughter to the Chandras.

Sky met the Shopkeeper and the Captain again in Sarah Jane's attic, where they confirmed that they were the ones who had dropped her off at Sarah Jane's. Sky wanted to stay with Sarah Jane and the Shopkeeper agreed before they teleported away. "Sky Smith" had become Sarah Jane's daughter.

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.

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 with her both 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 both noticed something was wrong with Mr Serf when 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 and finally did so as she resisted his attempt 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 he 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.

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, but 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, offering to facilitate getting her a good job there. Sarah Jane and her gang then returned home. Sky was treated to a picture of herself drawn by Clyde and hung up by Luke. She then embraced her brother.

Biography from the TARDIS Data Core article, licensed under CC-BY-SA