- Time traveling historians, Petra and Kipp, plan a relaxing vacation to 1881 Tombstone, Arizona. To the casual observer, Petra appears to be an attractive young woman, while Kipp plays her canine companion. But fun turns to danger when Doc Holliday assumes the role of Petra's protector. Now the symbiotic duo risk becoming entangled in the power struggle between warring factions and breaking the Symbiont Code: never interfere with history's natural progression. THE SYMBIONT TIME TRAVEL ADVENTURES, 1. The Symbiont 2. Tombstone, 1881 3. Whitechapel, 1888 4.The Great Locomotive Chase, 1862 5. Titanic, 1912