Water.
Earth.
Fire.
Air.
Katara's grandmother used to tell her stories about the old days: a time of peace when the Avatar kept balance between the Water Tribes, Earth Kingdom, Fire Nation and Air Nomads. But that all changed when the Fire Nation attacked. Only the Avatar master of all 4 elements; only he could stop the ruthless firebenders. But when the world needed him most, he vanished.
100 years passed since Roku's disappearance, and the Fire Nation was nearing victory of the war. Countless innocent lives were slaughtered and taken by the Fire Nation, most of the Southern Water Tribe's waterwenders were captured and taken. Never to be seen again, and Katara's mother Kya sacrificed herself to save her in a raid when she was only 5.
On year 98 of the war, Katara's and Sokka's father Hakoda and the other men left to help the Earth Kingdom.
Some people believe that the Avatar was never reborn into the Air Nomads and that the cycle is broken, and that the Fire Nation has wiped them all out to extinction.
But Katara never lost hope. And she believed that, somehow, the Avatar will return to save to world.
2 years later, she and Sokka discovered Aang in an iceberg with his Sky Bison, Appa. Who has survived by running away, and formed an iceberg around them.
And that's when their journey begins.
After the encounter with former Prince Zuko, they'd traveled the world for Aang to learn the other 3 elements. And Katara finally became a better waterbender.
As time went on, they've been joined by a blind earthbender named Toph.
But after a fight that nearly cosh Aang's life, they were forced into hiding in the Fire Nation.
And soon after recovery, they along with their allies invaded the Fire Nation during a Solar Eclipse.
But have failed.
Towards the end of the summer, the biggest battle in history took place as Sozin's Comet soars over the Earth. And Aang battled Ozin, and soon defeated him.
And Zuko's sister Azula was also defeated.
Soon, Zuko was announced Fire Lord. And soon the world, for the first time in over a century. Has returned and restored into peace.
3 months after the war, peace has restored the world.
And for one remarkable group of friends.
A journey through life...
Is a heart pounding adventure.
But what Aang and his friends are about to find out.
Is that something...
Big.
Is coming.
Our Galaxy.
The Milky Way.
Our Sun takes 225 million years to loop around the Galaxy once. One Era in particular lasted 165 million years. So if one rotation of the Galaxy is...
1 hour.
The Earth is 20 hours old.
Certain creatures lived for 48 minutes.
And us...
48 seconds.
The Earth appeared 4.6 billion years ago, and 1.6 billion years later. Is when the first singled celled living organisms appeared.
Hundreds of millions later, and soon Earth became home to so many strange and bizarre creatures.
Some, you can't even imagine or believed they even existed.
It was the dawn, of the Paleozoic Era.
Millions of years came by, and creatures have come and gone throughout the oceans. But then, one revolutionary creature appeared. To crawl out of the sea, and onto to dry land.
And soon, creatures conquered the land, the air and now land.
But then, 110 million years after the first Human ancestor crawled to land. The largest mass extinction in Earth's history happened. The cause from massive volcanic eruptions, followed by many more. 95% of all life on Earth, vanished into extinction.
It was the Permian Extinction.
The Great Dying.
Our ancestors were able to survive and escape with their lives and were only hanging by a thread.
20 million years later, out of the deserts came something revolutionary. A group of Reptiles destined to rule the Earth, for 165 million years.
The Dinosaurs.
It was the dawn of the Mesozoic Era.
And soon, Dinosaurs...
Took over the world.
Over the course of 30 million years, Dinosaurs got more and more successful. Until they were the biggest.
The fiercest.
And most incredible animals on the planet.
Whatever the climate, whatever the habitat. Dinosaurs made it their own.
Their strength, was the able to adapt.
They grew to gigantic sizes.
Evolve into powerful killers and monsters.
Like the famous Tyrannosaurus Rex, and Raptors.
And their distant relatives, the Pterosaurs. Have even laid claimed, to the skies.
But sadly, as the old saying goes.
All good things, must come to an end.
65 million years ago, at the end of Late Cretaceous. A meteor, as big as Mt. Everest, 6 miles across. slammed into the Gulf of Mexico, in the Yucatan Peninsula, in Chicxulub. With the force of 100 million Atomic Bombs. The impact results were unimaginable, even in your worse nightmares. Firestorms, earthquakes, and megatsunmanis, and finally the sun was blocked for many for years. Over 70% of all life on Earth, died out.
All the forests in North and South America were destroyed by fire. Already weaken, Dinosaurs are the animals that suffered most. If they don't as a result of the impact, and it's immediate consequences. They will die gradually, in the aftermath.
In a relatively short time, in a matter of months.
Dinosaurs become history.
Or do they...
The Dinosaurs might've been wipe from history.
But not forgotten.
But imagine you could travel back in time.
Back across 65 million years.
As you travel, you would see huge changes in the vegetation and the climate. Even the surface of the Earth itself, would move. As mountain ranges are pushed up, by colliding continents.
You would then reached a remarkable time in Earth's history. Known as the Cretaceous.
It is a very different world.
The Himalayas do not yet exist, and the Atlantic is only half as wide. There is no grass, only conifer forests and fern prairies.
This is a world, ruled...
By Dinosaurs.
But further back, there was the Jurassic Period. A time when life on Earth, was at it's most spectacular.
The creatures of that time, bathe in a warm tropical climate. There are no ice caps at the poles. Flowers and broad leafed trees are yet to evolved. In the air, and on the land. The world is dominated by Reptiles. And by far the most common...
Are the Dinosaurs.
Throughout the Mesozoic, wherever you go, you'll find a bewildering variety of Dinosaurs.
Some are miniatures. A foot long.
Others, are more massive.
And the biggest of those of predators, are dwarfed by of the herbivores.
But they are not the only giants.
Huge Pterosaurs rule the skies.
And below, massive Marine Reptiles harvest the rich oceans.
No matter what happened, either climate change or the final outcome of the meteor impact. Extinction found these creatures, but life always bounces back. To create new worlds.
And sometimes, have the most strangest events.
And Life...
Finds a way.