Jamie McCrimmon was an inspiration for the book and TV series Outlander. Just another example of the kind of ideas the Whoniverse includes in passing that could spin off to entire sagas on their own.
This one is probably the bestselling leading example of the time travel romance sub-genre, and the time travel romance with Highlanders sub-sub-genre. Which other sub-sub-genres could become adventures or provide characters? Sub Dan Brown conspiracy theory pulp adventures? Medieval detectives? Ninja comedies?