Jamarcus should not have been an alien
I can think of only one reason for the plot twist of revealing Jamarcus as an alien; and that was for him to reveal the aliens weakness to the team. I actually figured he was the alien much earlier in the show when his buddy did not attack him in that man's backyard.
There are several reasons why they should not have done this. First and foremost it makes no sense to have one alien turn on and kill his own entire race just because he didn't like a couple of them or because he liked or pitied Earthlings so much. It also did not have to be Jamarcus coming to save the team with the information about their weak point. That could have been revealed in a variety of different ways, accidently even. Hell, the woman could have saved them. That would have cemented her role on this new "team".
Many of the scenes previous to the revelation did not make sense and were only put on for the audience. Why have Jamarcus give his dead alien comrade a BJ? Why have Jamarcus excited when that orb blew things up? Why have Jamarcus acting scared *beep* in the guy's backyard? These and many more instances of only pretending for the sake of the audience when the characters did not need to act that way.
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