Doctor, The Doctor leaves Sarah Jane a new K9 model, K9 Mark IV, and takes her advice by inviting Rose's boyfriend Mickey Smith (Noel Clarke) aboard the TARDIS as his second companion. The success of "School Reunion" led to the development of The Sarah Jane Adventures, starring Sladen as Sarah Jane, produced by BBC Wales for CBBC. In The Sarah Jane Adventures, Sarah Jane investigates alien activity covertly from her manor house in Bannerman Road in Ealing, driving an emerald green Nissan Figaro and with the help of her sentient supercomputer Mr Smith (voice of comedian Alexander Armstrong), as well as an alien activity scanner and sonic lipstick device. In the special premiere episode "Invasion of the Bane" (2007), Sarah Jane adopts a son: Bane creation, genetic archetype and boy genius Luke Smith (Tommy Knight), and befriends her neighbour Maria Jackson (Yasmin Paige) during her investigation of Bane leader Mrs Wormwood (Samantha Bond). Sarah Jane remarks that since meeting them she is no longer content to live alone; she discloses she never married after parting from the Fourth Doctor, to whom no one could ever compare. Sometime between "School Reunion" and "Invasion of the Bane", K9 has left Sarah Jane to close off a black hole, occasionally passing close enough to contact her; due to the concurrent development of the K-9 television series, to which creator Bob Baker owns the rights, K9 only appears in two episodes of the first series. In the first series, Sarah Jane learns how to be a mother to Luke, the while strengthening her friendship with teenage neighbour Maria, the person Sarah Jane "trusts the most". Along with Luke and his friend Clyde Langer (Daniel Anthony) they defeat and repel various threats to the contemporary Earth. Amongst these threats, series one introduces The Trickster (Paul Marc Davis), a cosmic being who makes alterations to the timeline to cause chaos and destruction; he becomes a recurring adversary for Sarah Jane. Sarah Jane finds a new enemy in the Slitheen, a family of criminal aliens originally seen in Doctor Who, and an ally in alien research scientist Professor Rivers (Floella Benjamin). Time travel scenes also depict 13-year-old Sarah Jane (Jessica Ashworth), for whom the death of her best friend Andrea Yates (Jane Asher) gave Sarah Jane her resolve to fight against loss of life. Sarah Jane then reappears in Doctor Who in the two-part fourth series finale