. . . "Key to Time" . . . "following season" . "Season 16" . "Doctor Who (season 16)" . . . "16" . "Doctor Who (season 16)" . "season 16" . . "1978-09-02" . "''Key to Time'' season" . . "16th season" . . . . "Season 16 (1978\u201379)" . . . . . "26" .