So, A Fandom Walks into a Bar...

This started as a sentence story (friend writes a few words, then passes it to the other and it keeps in rotation between the two) so the beginnings rough but:

The Vampire Diaries meets Doctor Who and Sherlock then go get lost in New York City and find Kat and Lex, members of the band 13thStreet from there the Doctor takes them on magnificent adventures through parallel worlds.