In the case of the Lupari, I've also seen it suggested that the image of them originated from a repressed Fugitive Doctor memory buried somewhere in the Tenth Doctor's subconscious.I've seen comments that Rose's shed having Lupari and Cyberman plushies means Donna must have had off-screen adventures involving them, but this forgets that both Donna and Rose had Time Lord knowledge (specifically, the Doctor's) via the Metacrisis...