By Any Other Name
A Doctor Who/Daniel Boone Crossover
A raggedy stranger awakens in 18th century Kentucky with no idea of who he is. Plagued by visions of another time and
place, tortured when he tries to remember, a man known as John Smith sets out to find out who he is and what has
happened. Meanwhile, River Song is sent by Father Octavian to the same place and time and ordered to prevent the
cataclysmic consequence of a choice made by the Doctor in the far distant future - no matter what.
Doctor Who and Daniel Boone Who's Who

And if you enjoyed this story, check out:
A Polymorphic Counterfeit - A Doctor Who/Young Rebels crossover