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Stream was a Proto-Time Lord clone of River Song.

Stream was created on Demons Run by Madame Kovarian, along with six other clones. After the Eleventh Doctor raided Demons Run, Stream escaped on a ship with the other six clones. As part of his religious cult, Lake convinced them to die multiple times on Terminus Prime so he could covertly study regeneration and find out how long he was able to live. (AUDIO: The Lady in the Lake)