At the park, Jack and Kyle had sent a Jeep back into the Jurassic, in order to help Drew, Cynthia and Leon track the herd of Diplodocus. The Jeep had driven in pursuit of the giant herd; only stopping when Cynthia had found more tracks. For three hours, they hadn't seen any trace of the gigantic animals, only their footprints; however, after three hours, they'd caught up with the herd on a large salt plain. About twenty-five enormous, grey creatures were walking across the salt flats; this was some kind of migration.

Cynthia, looking at the herd through binoculars, said "OK. How are we going to get this lot back through the portal? Any ideas?". At the end of this statement, she turned to look at Drew. Drew rolled his eyes and said, in reply, "I have a plan, alright? We just need the right opportunity to implement it."

However, they soon realised they weren't the only ones who were following the herd, too. Soon after they began observing the herd, they'd noticed three subadult Allosaurus following the herd. Drew had been planning to get two species for the price of one… The Allosaurus trio began scanning the herd, looking for potential targets. Their eyes locked on a potential target; a weaker Diplodocus, at the back of the herd.

In a fraction of a second, the Allosaurus rushed into the herd, towards the weakened Diplodocus, snapping at the weakened Diplodocus' heels like sheepdogs, before recoiling again. For about half an hour, they repeated this process; each time they did it, the sickly Diplodocus moved a little further away from the herd. Eventually, the herd had moved on, leaving their weakened companion behind… and at the Allosaurus' mercy. "Hurry!", Drew, not wanting to miss the opportunity afforded by this, yelled to Cynthia and Leon, "Set up the portal!" The two others suddenly snapped out of their state of shock and began to set up the portal in the direction towards which the herd were moving. The entire herd moved through the portal, into the present.

The Allosaurus had the weakened Diplodocus surrounded. They stood, hesitantly; even a sickened Diplodocus could seriously injure them. Eventually, the sauropod began to tire, and the Allosaurus struck. The first Allosaurus jumped onto the sauropod's flank, beginning to tear at the sauropod's flesh with its teeth and claws, inflicting deep wounds, before nimbly jumping off its prey's side, landing on its feet like a cat, before the sauropod could crush it. The sauropod now had deep wounds on its side, from the Allosaurus' teeth and claws. The second Allosaurus attacked from the opposite side, tearing at the flesh of the sauropod's flanks, followed by the third, who left deep wounds on the sauropod's rump. This went on for over an hour, with the sauropod's injuries growing in intensity and its blood loss increasing, until it dropped to its knees in a spray of blood, staining the salt red.

The allosaurs stood back as their prey entered its death throes. They knew that a single kick from the sauropod could kill them. Eventually, the sauropod's spasms ceased, its breaths became shallower and its eyes glazed over. It was dead. The allosaurs dived on it and began to feed. Drew, Cynthia and Leon stood back; they didn't want the predators attacking them. Leon, however, had observed the hunt with rapt interest; especially how the allosaurs had co-ordinated their efforts to bring down the Diplodocus. "I wonder…", he muttered.

Suddenly, a larger Allosaurus ran out onto the salt flats. Not wanting to give up their kill, the three smaller males hissed at this newcomer. However, the larger animal prevailed and chased the trio off. Not wanting to miss the opportunity, Drew set up the portal and the three young allosaurs ran towards it, into the present.

It was at this moment they realised that the large Allosaurus looked familiar. Drew said to Leon, "That's the female Allosaurus from before; the one that caused the Apatosaurus to stampede." Leon nodded and said, "Yeah." They stayed back; they didn't want to get between a predator and its meal. The Allosaurus ate her fill, ripped some meat from the carcass and carried it away from the salt flats.

They decided to send the Jeep back through the portal, in order to avoid alerting the alllosaur. Instead, they would track it by foot. And, so, they hiked from the salt flats to the denuded forest, in pursuit of the giant theropod. For two hours, there were only fleeting glimpses of a sandy-brown, striped shape ghosting through the forest; however, that was about to change. As they walked past a forest clearing, they suddenly heard a small, cheeping sound, from a forest clearing.

Bursting into the clearing, they looked around to see two Allosaurus chicks, with downy black and white feathers looking forlornly at a dead adult Allosaurus. They knew what it meant immediately; the chick's mother had died from the drought, and they were orphaned. After sending them through the portal, they heard a low, anguished roar from behind them. Running towards the sound, they saw something that caused Drew, Leon and Cynthia's hearts to drop. It was the female Allosaurus, stuck to her knees in quicksand. She let out several, low anguished roars as she continued to struggle to get out of the mire. Drew said, with a note of urgency in his voice, "We need to act fast, or she's going to die." Leon said, "Have you got a plan?"

Drew smirked, "In fact, I do. Cynthia, go through the time portal, take some rope and tie it to the end of the Jeep. I really don't know if this will work, but it's all we have to work with right now. If we don't' do this, she's going to die"

Cynthia nodded, "OK", and went through the portal to the present, bringing back the Jeep. Once she had come through, Drew grabbed the hook end of the winch and tossed it towards the allosaur, who grabbed it in her jaws; the winch had been attached to the jeep, which Cynthia was driving. Drew yelled, "Now!" and gave the signal, to which she activated the winch, The Allosaurus took notice of this, and attempted to pull on the rope like a dog with a new toy; however, she was losing the battle. There was method in this seeming madness; every time the allosaur pulled forward, she moved slightly forward in the mud. Eventually, she had moved close enough to the edge of the pool to pull herself out. After she had done that, Leon activated the portal, which the Jeep tore through. The female Allosaurus walked through the portal, after the hook.

At the portal site, they were met by Jack. "Hi, guys!", he said, "You are not gonna believe the day we've had…", he trailed off, looking at the mud-covered Allosaurus. "You, too, huh?", he responded. Soon the Jurassic creatures were all transferred to their new homes. The Ornitholestes had been provided a small forest to clamber and hunt in, in a new area called Mesozoic Tropics. The Allosaurus had been moved into a large paddock, in a new area called Theropod Kingdom. They were currently roaming their new territory, and waiting for their next meal. The Anurognathus had been transferred to an indoor, nocturnal aviary, whilst a new section was built for them. They were currently exploring their new territory. The juvenile Diplodocus had been put in the Discovery Outpost, until they were big enough to join the adult herd. The baby allosaurs were there as well, until they decided what to do with them. And the large herds of herbivores were all being transferred to Mesozoic Safaris; a huge area of land composed of forests, savannahs, rivers, even a lake complete with waterfall. Three containment trucks had pulled up for the smaller herbivores. The first truck opened and the Othnielosaurus hesitantly walked into the exhibit, moving as if a unified entity. The second let out the Dryosaurus, who sprinted into the bush. The third truck let out the Stegosaurus, who stepped out the trucks, one by one, into their new home.

The sauropods, however, were two big to transport using the trucks; so, instead, using food and recordings of their calls, the sauropods were being herded towards Mesozoic Safaris, their new home. Four Park Jeeps followed the herd, corralling them in; every time one strayed, the Jeeps would herd it back to its compatriots. Eventually, the herbivores were all in their new home. Mesozoic Safaris was beginning to fill up.

In Theropod Kingdom, Leon was watching the allosaurs intently; after witnessing their ruthless hunting skills in the Jurassic, he'd had a few ideas regarding them. He'd taken particular interest to the degree that the allosaurs had co-ordinated their efforts to bring down the Diplodocus. He'd had quite a few ideas regarding them; which, some day, he would implement…

Meanwhile, in Drew's office, Drew was looking at the files for the next mission. Cynthia was with him. "I'm taking it Leon has become very interested in the allosaurs?", Drew asked, as he looked over his files for the mission. Cynthia nodded enthusiastically, "Yeah! He's been spending every day at their enclosure; haven't got the foggiest what he's got planned", before turning to leave. "Cynthia!", Drew said, stopping her in her tracks. She turned to him and said "What do you want?". Drew looked around sheepishly and said "Would you like a drink?".

Next time on Prehistoric Earth, the team goes back to the oceans of the Late Jurassic

(an ichthyosaur leaps out of the water)

Where they meet new friends

(Adrian holds an injured pterosaur)

And deadly marine predators

(A large pilosaur emerges from the depths)

Meanwhile, back at the park, Leon implements an ambitious plan with the allosaurs

(Allosaurus roars at him)

All next time on Prehistoric Earth: The Cruel Sea!

Animals rescued:

Dryosaurus: 27 (16 male, 11 female)

Othnielia: 33 (16 male, 17 female)

Anurognathus: 89 (54 male, 35 female)

Stegosaurus: 8 (3 male, 5 female)

Brachiosaurus: 14 (7 males, 7 females)

Apatosaurus: 26 (9 males, 17 females)

Ornitholestes: 5 (4 males, 1 female)

Diplodocus: 77 (34 males, 43 females)

Allosaurus: 8 (6 males, 2 females)