Kirstie

History
Kirstie was born in July, 1995. It is unknown what happend to her parents or why she was brought up evil.

Evilness
Kirstie is a evil 15 year old, who craves nothing but revenge, evilness and tourture. Kirstie is obsessed on getting revenge on Lyndsey and her siblings out of jealousy, because of their spy heritage. In late 1999, Kirstie attended Sunnyside Nursery and met Lyndsey, while her siblings disliked Kirstie.

Kirstie somehow decided to use Lyndsey to become her friend and turn her against her other friends, so she planted Lyndsey's favirate doll in Penny's wendy house, writing all over Lyndsey's drawing and framed Butterfly, and saying to her that Hayley hates her, which upsets Lyndsey. Kirstie was later found out of her wicked ways.

13 years later, Kirstie returned again to get revenge on Lyndsey and the others, by kidnapping the seven siblings before Dan and Lydia rescue them, kidnapping Lyndsey several times but fails, and even getting Dan on her side and has her boyfriend, after Lyndsey finds out that he love potiened Charlotte, Dawn and Jane.

In The Future special, in the year 2025, Lyndsey has given birth to a baby daughter, Lucy, after marrying Luke Like. however, Kirstie interupts Lucy's birth by kidnapping her, and demands Lyndsey to give up spying or Lucy dies, so Lyndsey agrees to give up spying. 10 years later, Lucy is a smart ten year old, who she reminds Lyndsey of her old and closest friend, Melody Triton. Lucy then meets Kirstie and is then used as a pawn to turn her against Lyndsey, by stealing all of the spy watches from her mother, uncle and aunts. Kirstie then suceeds in getting Lucy to do her bidding when Lyndsey arrives, until Lucy finds out about the evil Kirstie.

Kirstie has a son with Dan named Andrew, and possibly a daughter, Margot.

Castaras
Kirstie will appear in the new 2017 cartoon crossover tv series, returning as a villian, plotting with Baboon to kill all the goodies.