Obligatory River Song speculation thread

Since the previews for A Good Man Goes to War have promised that the Doctor will learn “who River Song really is”, this may be my last chance to go on the record with some wild speculation about what the reveal will be.Spoilers!Let’s start with the most popular fan theory: River Song is the Timehead. Certainly, this theory fits the available evidence well enough, and nothing directly contradicts it. It would add a selfish element to River’s admonition to Amy that killing the Timehead would create a paradox.
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