[Putting this here so your reply winds up in my inbox and I don't have to worry about losing it! Also to check if you had any setup ideas. I'm figuring either Rose (probably not realizing she can, maybe something to do with the TARDIS key?) calls the Doctor, or some emergency to do with the walls between universes happens, orrr he just finds a way, maybe during his "farewell tour" at the end of s6. Thoughts?]
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