fourth serial of Doctor Who
... that the entire fourth serial of Doctor Who is missing after being erased by the BBC in 1967?
... that the entire <b id="mwAds"><a href="./Marco_Polo_(Doctor_Who)" id="mwAdw" rel="mw:WikiLink" title="Marco Polo (Doctor Who)">fourth serial of <i id="mwAd0">Doctor Who</i></a></b> is <a href="./Doctor_Who_missing_episodes" id="mwAd4" rel="mw:WikiLink" title="Doctor Who missing episodes">missing</a> after being erased by the <a href="./BBC" id="mwAd8" rel="mw:WikiLink" title="BBC">BBC</a> in 1967?