Medical journals have documented at least a few dozen cases of people who died and then, somehow, came back to life. The catchier term for this phenomenon is the "Lazarus syndrome," so named for the man raised from the dead by Jesus in Christian teaching—divine proof of God's dominion over life and death.
But in the new horror film The Lazarus Effect, this kind of reanimation is orchestrated by humans with disastrous consequences. The movie, produced by the same studio that made low-budget horror hits like the Paranormal Activity franchise and Insidious, is one of a number of films to explore the phenomenon of people brought back from the dead, but it's rare in that it does so, fleetingly, from the subject's perspective. Most supernatural stories about "resurrection" feature zombies or ghosts or other beings that aren't, strictly speaking, alive, and proper undead horror stories tend to focus more on the alarming experience of witnessing the phenomenon from the outside.
The Lazarus Effect, on the other hand, has (short-lived) empathy for its undead character. In the film, a group of scientists bring a dog back to life with the help of a special serum injected into the brain and stimulated by electricity. When a trial run goes wrong, one of the scientists Zoe (Olivia Wilde) dies and is later revived. But strange things begin happening to her—she has visions of a childhood nightmare, she can move objects with her mind, and, this being a horror film, she's possessed by the sudden desire to murder everyone around her.