Cosmic Bodies (1 ep)
The Diary (1ep)
Earthshock: Return of the Cybermen (3eps)
 
Fox Hunt
 
K-9 Defender of Croydon
The Year That Never Was
Connected
The Hidden Enemy
Into The Trap
 
 
 
 

There have always been Doctor Who spin-offs. Other stories told in the Whoniverse from the back-up strips in Dr Who Weekly through K-9 & Company in 1981 to the modern TV Series Torchwood and Sarah Jane.