Bannerman Road gang

The Bannerman Road gang, once referred to by Clyde Langer as defenders of the Earth, (PROSE: Day of the Clown) were a group of teenagers and one adult that was formed by Sarah Jane Smith, a former companion of the Doctor, to help her fight alien threats that came to Earth.
The group initially consisted of just Sarah Jane and Maria Jackson, but Luke Smith joined after being rescued by Sarah Jane from the Bane. (TV: Invasion of the Bane)
Clyde Langer later joined after helping Maria and Luke to fight off the Slitheen. (TV: Revenge of the Slitheen)
Maria later moved to America with her father, and a new girl called Rani Chandra moved into Maria's old house and soon joined the gang. (TV: The Last Sontaran, The Day of the Clown)
Luke eventually moved to university, but stayed in contact with the rest of the group. (TV: The Nightmare Man)
After being rescued by Sarah Jane, Sky Smith later joined the group. (TV: Sky)
Other members included Mr Smith, a Xylok, (TV: The Lost Boy) and K9, a robot dog given to Sarah Jane by the Tenth Doctor. (TV: School Reunion, Invasion of the Bane, The Lost Boy)