I played something like it in The Nine Princes of Amber the RPG. I DMed a couple of sessions for it,
PreWorldWar1 Germany is a fine mess to play in. Frankenstein's younger, crazier brother leads parachuting flesh golems to kill Winston Churchill via Zeppelins. Play which ever side you think best. "Da Kisar's supra soldiers, ya!"
The next session I sent them to North America some 25,000,000 years ago on a plane that did not take a killer asteroid strike. They (the PCs) expected furious, killer Velociraptors they got intelligent, well-mannered Velociraptors. One standout npc was Suzy (I channeled my inner teen bobbysoxer), a precocious, (wearing a necklace of pearls,) 14-year-old Velociraptor. She would call them “Mammals wearing skins!!!” The npcs had a society similar to elephants, (matriarchal.) Bulls live solitary lives. It's' like get the itis bitsy mammals passed the big bad bulls through the Appalachian Mountains.