Early in the first episode, there is a scene where the Doctor and Jo are working on the TARDIS console in the Doctor's lab. A mistake by the Doctor causes another Doctor and Jo to briefly appear at the entrance to the lab and then vanish. Originally the serial was to end with a scene where the Doctor and Jo went back to the lab, and saw their earlier selves working on the TARDIS console as before, after which "they" would vanish. However, director Paul Bernard refused to film it, saying "Once it's over, it's over". Script editor Terrance Dicks would later restore the scene in his novelisation of the story. This story features the TARDIS console once more outside of the TARDIS itself, as in "The Ambassadors of Death" and "Inferno".