New neighbour Rani Chandra and adopted daughter Sky Smith later join the cast. Additionally, the group is aided by Mr Smith, a sentient extraterrestrial computer, and K9, a dog-shaped robot gifted to Sarah Jane by the Doctor.
Later, new neighbours Rani Chandra and Sky Smith joined the team. The group also received help from Mr Smith, an intelligent alien computer, and K9, a robotic canine given to Sarah Jane by the Doctor.