Just starting watching Invasion with my brother and have to say that I really enjoyed it so far. It does start a little slow while it builds its world and characters up but I don't mind that. It does a good job of making you actually care about what happens to these characters. I don't understand why there are so many mixed reviews. If you like this kind of sci-fi genre then there's no reason not to like this. The acting and writing are both great as are the visuals. I'm glad that it did well enough to warrant another season because there's definitely still more story to tell. It's been nearly two years since the end of season one but the new season is finally coming out this summer.
