Not having seen any trailers for this movie, I wasn't really sure what to expect. Obviously from looking at the cover, one can intuit that this is a science fiction show, likely animated. Terra is of course latin for Earth, and it's very common in science fiction to use it as a name for our planet in place of Earth. So, maybe some kind of alien invasion movie?
This fit very well with the very menacing skeletal object in space that we see during the opening, approaching a lush blue planet, but I was surprised to find that the inhabitants of the planet are actually pseudo mermaids, who float around through the atmosphere, and live in harmony with their beautiful world where plants grow hundreds of yards tall, and homes can be fashioned in their arms. Really from what we can see of Terra, it looks more like the upper atmosphere of a gas giant more than an Earth analog. But it is very beatiful, and most importantly, alien. Not all is hunky dory though, there are marked off areas, where people are simply not meant to go, and all attempts at developing technology are sternly frowned upon.
Lo and behold, the pilot is a human! Gasp! Turns out that after terraforming Mars and Venus mankind's three planets decided to wage war on each other, ultimately making the entire solar system uninhabitable. The only option is to pack as many people as possible onto a generation ship, and send it to the nearest solar system that may harbor life sustaining planets.
Which catches us up to where we started, the generation ship is now falling to pieces, and humanity needs to get on a planet quick, they essentially have two options, try and reason with the natives, or just kill them and terraform the planet.
I won't go too much into it, but this was a surprisingly good scifi adventure, with all of the things you'd normally expect from a blockbuster action flick.