I’ve been sitting on this for a while, but it’s gold and deserves to be seen: SciFind’s list of 11 alternate universe female Doctors is simply brilliant, and rewards a careful read if you know your Who history.
For example: this alternate-universe Eighth Doctor is Helen Baxendale (as opposed to Paul McGann). There as here, the Eighth appears only in an orphaned TV movie years after the show was cancelled, and more than a decade before the revival. For reasons I’ve never understood, the producers cast Eric Roberts as longtime foe The Master. Go check to see who plays “The Mistress” in the alternate universe. ;)
Also, total wins: Honor Blackman in the 1960s, opposite Vanessa Redgrave as the Mistress; Joanna “AbFab” Lumley in the 1980s; and Suranne Jones as the Ninth (most famous to Whovians as the personification of the TARDIS in the Gaiman-penned “The Doctor’s Wife”).
Go. Read. Enjoy.