From publisher blurb:
You live easy lives, hunting dinosaurs, sharpening spears, and trying to master fire. Then the Big Thing That Fly came. Like an animal bladder filled with air, but bigger than an apatosaurus. Funny men used magic spears of fire and thunder to attack the People of the Big Cave and People by the Lake. Some died. Many were taken.
Now you must save your people from the Big Thing That Fly. But first you’ll need to get there.
Ug See Big Thing That Fly is an adventure for Savage Worlds in which the heroes play cavemen and women and dinosaur people fighting an incursion from the future. It is set in the world of Kron, and works as stand-alone one-shot or a prelude to the upcoming Kronocolypse campaign setting. It includes six pregenerated characters.