About Doctor Who Season 0, Episode 12 :

A powerful unknown enemy is stealing the Doctor's past incarnations and transporting them to the Death Zone on Gallifrey, where they will be forced to play the deadly Game of Rassilon. This version features extensive use of alternate takes, a Dolby 5.1 surround soundtrack, and updated CGI effects. It was originally released on VHS with "The King's Demons" and has been released multiple times on DVD, as well as broadcast in syndication.