Big Finish has released an audio version of Avengers Too Many Targets, based on the novel by John Peel and Dave Rodgers.
Basically a spin-off from Doctor Who Lady Christina.
Colin Baker reprises his role as the sixth Doctor in the Big Finish Doctor Who story, Hour of the Cybermen
Georgia Tenant reprises her role as Jenny for Big Finish Productions.
Some of the Doctor’s earliest companions return in this series from Big Finish. Doctor Who’s companions
New Doctor Who stories are coming from Big Finish Productions, with Tom Baker appearing as the fourth Doctor. Take a look. Tom Baker as the Doctor