Good actors, no standard heroes, good background stories, just the right amount of mystery. I loved how the character of the sheriff revealed it's secrets as it developed from the suspicious may-be-alien to a almost normal person. The first few episodes were kind of slow as they built up the characters backgrounds and went for some chemistry and unfortunately that coupled with a lot of pre-empts from the network eroded the audience but for those who stayed it was well worth the time invested. "Invasion" inspires the imagination with a level of creativity that you rarely see on the network.
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