Finally, other outside circumstances can prevent the completion of a piece of television. The 1980 Doctor Who serial Shada was abandoned after strike action prevented the cast and crew from gaining access to the studio, and rearranging filming of the serial was deemed as less important than recording Christmastime programming, so it was left incomplete. A 1992 release linked filmed scenes with narration to describe missing scenes, for a VHS release; then in 2017, the original cast was reunited to record audio for an animated reconstruction of missing scenes according to the original script.