Back to Earth

Many years ago scientists discovered a new
planet that was similar to earth and improved it with machines and technologies. At first, it was not really accepted especially since it was in a kind of dimension which you could not get to by
space but through a portal but due to war and environmental hazards as a result of wastes from experiments, industries and
natural disasters which contaminated the earth, it was approved and almost everyone
went to the other planet named "2nd Earth/Earth Two" in order for the earth to naturally heal.
Years later the earth was believed to have healed and due to the time away from earth, the mesozoic era seemed to have evolved again as a result of a shift in the portal which brought dinosaurs to the present times. But '2nd Earth' seemed to have
grown on the people so the scientists reversed the portal, thereby making it possible to only go one way (that is, to earth
but not backwards) and recruited those who were interested and were useful to the earth in their areas of study, passed their
earth studies test or were lucky winners picked randomly.

Unfortunately, it soon appeared that some were looking to exploit the earth for its rich resources and make the portal go both ways for their trade. This resulted in war
between them and the other inhabitants of the earth who wanted to keep it safe and enriched and there were lose of lives on both sides.

Fortunately, the colony of inhabitants were able to defeat them but the enemies managed to escape to somewhere faraway...

Inspired by Terra Nova (sad it got canceled).