Earthsearch was a BBC Radio 4 radio series written by James Follett which was later adapted as a science fiction novel. However, his prequel novel Earthsearch Mindwarp was adapted by Big Finish and is being broadcast by the Digital radio station BBC 7. Earthsearch Mindwarp stars a number of actors from the Doctor Who range — India Fisher, Nicholas Courtney and Colin Baker.
Read more about this topic: Big Finish Productions