Accordingly, a second radio serial featuring the Third Doctor, "The Ghosts of N-Space", was broadcast on Radio 2 in 1996. More might have followed, but sadly Jon Pertwee passed away in 1996, bringing the Third Doctor's era to a close. Barry Letts was thereupon commissioned, instead, to develop an idea for a radio play based upon the 1970s BBC science fiction series Blake's 7, which would ultimately lead to his writing two productions featuring cast members from that show, which were broadcast in 1998.