The pitch that they apparently sent out to writers a while ago was:
Superhero action in the vein of X-MEN about aliens who were put on Earth as a sleeper cell to eventually call back their race to take over the planet. Ultimately, the group of aliens fully assimilates and doesn't want to cause war. The main character has the power to destroy all with just his voice, so he is a mute (and his wife communicates for him).
From It's On The Grid
. (I remember this bit did the rounds on the geek sites a while ago, when it was first posted)