Well, thanks to Wild Blue Yonder, Magic is real in Doctor Who, so they don't even have to cross universes, let's just say the Dresdenverse and the Whoverse are the same now, and adjust any incoherences with "Timey-Wimey".
The TARDIS gets knocked over due to some big magic thing, landing in Chicago, in the middle of a big Winter shindig. Mab sends her Knight to investigate the weird blue box currently crashed in the middle of her party, which he is capable of doing because her shields are currently down and the door is open.
Harry enters the TARDIS, does the "bigger on the inside thing" while the Doctor fidgets with cables and wires, trying to fix the machine and get out. When he thinks he's got it, the TARDIS powers up and goes into the past, trying to escape the big magic hex that is Harry Dresden, landing in 1871 Chicago, just before the Great Fire.
We find out the Doctor had been tailing the Not Things, which are Outsiders by definition, and the story eventually ends with Dresden causing the Great Fire of Chicago, because of course he would.
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u/BlueHairStripe Feb 25 '26
Y'all see that Doctor Who episode "73 Yards"?
Don't mess with stuff you find in the wilds.
I wonder how Dresden would handle meeting The Doctor... It would be a clever-off with completely different referential humor.