'Invasion' is not a traditional sci-fi show with aliens, monsters and lazer guns. It is a drama of two families, built on top of an allegoric plot, that of bad (and good) parenting. You can completely replace the "alien" part of the show with a "disease" and still make sense out of it.
Truth told, Invasion is not well received by all viewers, mostly because viewers expect to really "get" Invasion just by watching a few episodes here and there. Big mistake. To truly understand and enjoy the show, you have to sit down week after week and watch all episodes in order. Failure to do so will result in confusion on the viewer's part.
Another problem with the show --which is now fixed-- is that the first 5-6 episodes that were setting up the huge storyline arc, were slow. Viewers were driven off Invasion because of that (even myself at some early point I had to push myself to sit down and watch it), but thankfully, the pace is now much faster and Invasion starts getting back that viewership. Especially after episode 9, the show has been captivating and keeps the viewer at the edge of his/her seat. Really!
Fichtner is doing an excellent job as the creepy sheriff who is both good and bad. Sheriff's assistant, Deputy Lewis Sirk (played by ultra-convincing Nathan Baesel), has emerged as a great character too in the later episodes. The rest of the cast delivers pretty well too.
