Time After Time (1979)
The Original: HG Wells (yes, him again, this time played by Malcolm McDowell), discovers that one of his best mates (David Warners) is actually Jack The Ripper.
Jack makes his escape using Wells' newly-built time machine and Wells tracks him to the 1970s, where the serial killer is re-igniting his bloody career.
With Added Doc Brown: On a random visit to the decade to pick up "retro" clothes to sell to hipsters, Doc encounters Wells and his newfound '70s companion Amy (Mary Steenbergen)
Falling instantly in love with her (because she looks exactly like his missus Clara - both are played by Steenbergen), he knocks out Wells and flies off with the woman.
Risk To The Space/Time Continuum: Now that Jack has a time machine all to himself, he cuts a swathe through some of the most famous periods in history, offing legendary women.
Cate Blanchett and Judi Dench's film careers suffer badly.
Next: The Jacket