This was so fun I decided to make another one!
Its August 1942, in Los Angeles California. The body of Jose Diaz is found dead near the Sleepy Lagoon. In our timeline it will be known as the Sleepy Lagoon murder [http://en.wikipedia.org/wiki/Sleepy_Lagoon_murder], but in this one it will only be remembered as the start of even more terrible war then the one already raging. Unfortunately Diaz's body rises from the dead and begins attacking nearby people who are investigating the crime. Perhaps this oddity was caused by a recent rip in the time fabric which, asides from causing the Z-plague to spread through the city, deposites three throughly confused time-travelers into this nightmare. Thomas Williams [http://en.wikipedia.org/wiki/Thomas_Williams_(Royal_Navy_officer)], a Royal Navy officer from the 18th and 19th century, Dietmar Mögenburg [http://en.wikipedia.org/wiki/Dietmar_M%C3%B6genburg], a gold-medal winning German high jumper, Victor Pellot [http://en.wikipedia.org/wiki/Victor_Pellot], the first black Puerto Rican baseball player in Major League Baseball, and me [http://www.escapistmagazine.com/profiles/view], perhaps the only one even slightly prepared for a zombie apocalypse out of this group.
While we battle for our lives in Southern California, the Z-plague begins to spread world-wide. This causes WW2 to grind to a halt as humanity turns to face an even greater foe: the living dead. (I imagine that Churchill would be forced to put his money where his mouth is due to his famous quote "If Hitler invaded hell I would make at least a favorable reference to the devil in the House of Commons." Now with a greater threat, he might be forced to put aside his differences with the Nazis and focus on the zombie menace.)