After Spear and Fang evade a pack of dromaeosaurs in the savannah, they experience a red lunar eclipse. They encounter a tribe of cavepeople who are attacked by gigantic red bats. They attempt to fight the bats off, but Spear is carried away by one, his spear being left behind with the cavemen. Fang pursues the bats to a tall stone pillar which she finds impossible to climb. Seeing the bats emerging from the top, she plays dead and allows them to carry her to a cave at the peak. While searching for Spear, Fang discovers the nest of a massive spider that the bats share their food with. Fang frees Spear, who helps her kill the spider. As the bats return, Spear and Fang use the spider's webbing to safely descend the pillar. Spear retrieves his spear from the cavemen as he and Fang flee from the bats. They lead the bats into the tall grass, where the gigantic bats and the dromaeosaurs attack one another while Spear and Fang safely escape towards the rising sun.