 :::(edit conflict) Perhaps the Superman article should be changed - although wasn't there a set of stories about Kal-El sometime ago? However, at the moment the character has appeared as 'River Song' in eleven episodes, as 'Mel' for part of one and her appearances as 'Melody Pond' have been minor. Speculation about the character's back story - which could easily be changed in a currently unwritten story - is speculation.   