A group of researchers led by Frank (Mark Duplass) and his fiancee Zoe (Olivia Wilde) have achieved the unimaginable: bringing the dead back to life. When Zoe is accidentally electrocuted in a horrific accident, Frank and his team use their experimental serum to resurrect her. But their attempt goes horribly wrong, unleashing terrifying powers within Zoe that put all of their lives in grave danger.