Eric watches as A LOOMING SHAPE emerges from the fog -- a nightmarish vision stalking purposefully forward.

A FULL GROWN PTERANODON,

standing over seven feet high, walks upright on clawed feet, his thirty foot wings folded bat-like at his side.

The creature sees Eric and fixes him with a demonic, menacing glare.

Eric cries out and dashes back down the teetering catwalk.

The Pteranodon ruses to its feet, spreads its thirty-foot wings and flies directly at him.

-

Hearing Eric's loud screams, Paul charges onto the catwalk, searching in the fog.

Suddenly, out of nowhere, Eric emerges from the fog, racing toward his father. And then-

The giant pterosaur then swoops out of the fog, opens its giant rear claws, and snatches the terrified boy from the catwalk.

Paul Kirby watches in stunned, abject horror as the Pteranodon carries Eric directly overhead-

"Eric!" His father called out.

The flying reptile struggles with the boy's weight.

Paul watches helplessly as Eric is carried high across the canyon. Paul runs back alone the catwalk in a desperate attempt to keep Eric in sight.

Billy stays behind, moving back up the platform to try to keep the dinosaur in view.

With a new idea, he races back up the stairs to the observation room. He has a way to save Eric.

When he reaches the canyon wall, Paul turns a corner and runs along another enclosed catwalk leading deeper into the canyon.

Grant and Amanda now come pounding down the catwalk trying to catch up with Paul.

As Billy buckles up and prepared for his task for redemption, Grant looks up to see Billy leaning out over the edge of the observation platform.

He suddenly realizes what Billy is about to do. Then runs after him, trying to stop him from attempting what appears to be a bit suicidal.

"Billy. Billy? Billy, stop. Billy, stop! Don't, Billy!" Grant yelled, worried for the young tutelage.

Trying to grab Billy, but it was too late, as Billy jumps off the railing and descends to the bottom of the canyon below.

Grant, Paul and Amanda watch as Billy past them like a stone, plummeting towards certain death. But then -- then expands and blossoms above him.

Not only does it slows Billy's descent, but he even manages to catch an updraft and begin to rise.

He struggles to control the parasail, swooping dangerously close to the canyon wall, barely avoiding it.

Up ahead, he catches sight of Eric and steers towards him.

Eric struggles to keep away from the hatchlings. But there's no way out of this nest.

Billy swoops overhead to where Eric is, but he's too high to reach Eric.

"Eric! Hold on!" Billy yelled as he soared by with the hang glider.

He circles around to make another attempt.

Paul rounds the corner and finally catches sight of Eric in the nest, some fifty feet below, fighting off the hatchlings.

"Hang on, Eric!" His father yelled.

Paul sees an outcropping he could jump onto from here. It's a big leap, though, he might not make it. He steels himself up for the jump, then chickens out.

Grant and Amanda come up behind him. Suddenly, a second Pteranodon crash lands on the catwalk enclosure about them: right next to a gaping hole in the mesh.

The catwalk groans with the extra weight. The pteranodon jams its head through the hole, snapping at them.

Billy circles, making his approach. In the nest, Eric kicks at the hatchlings, but they're undeterred. Billy and Eric will only have one chance.

As Billy swoops past, Eric jumps and grabs onto his boot. He is yanked up and out of the nest.

But then, the mother Pteranodon shoots past, tearing out a piece of the parasail in its beak.

The Pteranodon who landed on the top of the catwalk continues to snap aggressively through the hole in the enclosure.

Finally, the reptile's massive weight proves to much, and the entire section of the catwalk breaks off the canyon wall and laterally flips over.

Amanda, Grant and Paul are able to hang on for a while longer, but so is the Pteranodon, who now climbs their way.

His parasail being badly damaged, Billy tries to keep aloft.

"Eric! Let go!" yelled Billy.

Terrified, Eric falls into the river safely. He surfaces, immediately swimming to shore.

Trying to gain altitude, Billy bends hard to the right. But the rigging is too badly damaged.

He flies right into the canyon wall, hitting hard.

Instead of tumbling down to the river, he finds himself swinging from his harness, the parasail snagged on a rock spire above him.

Suddenly. the far end of this inverted section of catwalk detaches from the canyon wall and swings downward.

The force of the action sends the three tumbling directly towards the pteranodon.

Miraculously, they manage to avoid its open beak.

But they are all sent plummeting toward the river below.

They hit the water hard, resurfacing moments later. The current is carrying them downstream.

The two behemoth Pteranodons who were pursuing Billy now land on nearby ledges and consider how best to dispatch their prey.

Billy frantically tries to unhook his harness, but the tension is so tight from his own weight that he can't loosen the buckles.

Paul and Amanda emerge from the water by the canyon wall and find their son hiding behind a rock, searching the skies for Billy.

Amanda takes Eric tightly in her arms, and Paul urges them to keep moving. Up ahead, the mesh of the aviary meets the river.

Wading the shore, Grant now scans the canyon, searching for Billy. It doesn't take long to spot him.

Billy continues to struggle with the harness but to no avail.

The doomed young man is suspended high up on the canyon wall like a modern Prometheus, an entire flock of pteranodons gathering around him preparing to peck away his liver.

And everything else.

A mammoth pterosaur has landed beside him and looks him straight in the eye.

The gigantic creature lunges at him. Billy dodges away as best he can.

The pteranodon's frustrated bite severs a crucial juncture on Billy's harness, and Billy is able to wriggle free.

Eric, Amanda, Paul and Grant watch in amazement as Billy is the last to plunge down into the river.

"He made it!" Grant sighed in relief.

Billy bobs to the surface and spots the group downstream.

He waves and begins to swim towards them. Soon he nears the shore and gets to his feet, wading as he comes.

Grant, Paul, Amanda and Eric hurry to meet him. Grant is overjoyed to see him alive.

But his smile quickly fades as he sees

the entire flock began diving down from above in angry pursuit of their lost prey.

"Billy, look out!" Grant pointed to a flock of Pteranodons descending towards Billy.

Which he turns around.

Billy glances behind him.

He races forward, motioning fro his companions to turn around.

"Get back! Get back!" Billy yelled, in a warning tone. "Get away!" He yelled again, warning the others to leave before it happens to them as well.

Just then Billy is knocked down by the lead pteranodon.

The giant flying reptile strikes from behind with a brutal, calculated beak to the head.

Billy stumbles and falls to the ground. Grant rushes forward with Paul right after him.

Amanda takes Eric to safety down river.

Billy screams loudly in pain, as the whole flock of pterosaurs now swarm around him, picking him and nip him apart with their beaks and claws.

"Hang on, Billy!" Grant called out, determined to get Billy to safety, but it was too late.

"It's no use, Dr. Grant. No use. It's too late." Paul grimaced, as Billy was mauled to death by the behemoth flying reptiles.

He died... a hero.

Grant can't take his eyes off Billy, whose blood stains the water rushing by.

And now several more are heading their way.

Difficult as it is to leave Billy behind, Grant and Paul make a run for it. Just as the pterosaurs are about to swoop in for the kill, Alan and Paul dive back into the river...