Falling Skies will wind down season 4 with a trip to the moon, but those left behind will face a terrifying new threat from the Espheni.

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The TNT series will conclude its fourth season with an action-packed two-part finale. When a beamer accident puts Tom in mortal danger during "Space Oddity," Lexi will be the only one with the power to save him. Once the young hybrid chooses between her alien family and humanity, Tom's moon mission may be the 2nd Mass' only hope as they are prepped for human skitterization during "Shoot the Moon."

 Unfortunately for the resistance fighters, the battle will not end when the final credit roll.

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"I feel like we do end on a conclusion with a cliffhanger...it's more than a small cliffhanger, it's a pretty damn big cliffhanger but there is still a sense of accomplishment," said showrunner Daivd Eick, according to Three If By Space. "The season won't feel like a Pyrrhic victory."

Find out more when humanities battle for survival continues Sunday at 9 p.m. ET on TNT. Click the video below to see a preview for the finale.

Tags: falling skies TNT television