Invasion aired for one season from 2005-2006. Check out Jonathan Toomey's great reviewcaps here. Along with Surface, Invasion was one of my favorite new shows that season, with each episode getting better and better. By the series finale, I was hooked. I'm still miffed that ABC didn't give it more time to flesh out the story and characters.
Incorporating a sci-fi-alien mystery, a government conspiracy, and plenty of family drama, Invasion had a built-in audience because it aired directly after another sci-fi mystery, Lost. Unfortunately, it wasn't enough to keep the series on the air.
Yes, Invasion is still on. Of all the new Sci
Fi shows that premiered on the big three networks this year, it's the only one that is still hanging on. I saw the
first two episodes and quicky gave up because of the long stares from characters who may or may not be aliens. Oh, and
I couldn't handle the premise that a hurricane was bearing down on the town and no one was evacuating (school was still
in session, for crying out loud!). Anyway, I may have given up too soon because 
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