In a change of broadcast format, two episodes aired each week, on Thursday and Friday, meaning the entire series aired over a six-week period, with a complete storyline told each week. A slight change to the opening was made: Before the title sequence, Clyde would narrate the basic premise of the series over a montage of scenes. Among notable appearances this series, K9 Mark IV appeared in six of the twelve episodes and David Tennant appeared as the Tenth Doctor in the two-part story The Wedding of Sarah Jane Smith which aired in late October.