A nesting herd of Brachiosaurs is decimated when one of its members is infected with a zombie virus. Spear and Fang, apparently none the worse for their previous encounter, stumble across the devastated nesting grounds and have the bad luck to become the zombie sauropod's next target. Running for their lives, the duo trick the undead behemoth over a cliff and into a narrow ravine before finally escaping with their lives by making a mad dash for escape across a lava field. The brachiosaur's own massive weight is its undoing, dragging it down into the magma.