Defiance - Season 1 Episode 2 -

Having located the traitor who brought down Defiance's force field, the residents must now prepare for the upcoming battle. Nolan retrieves the device he and Irisa recovered from the crashed spacecraft as it will provide the weapon they need to defeat the coming onslaught. It's left to Doc Yewll to get it operational before the attackers arrive. Old arguments and ill-feeling is set aside and everyone in the community bands together.