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.