A parasitic alien soul is injected into the body of Melanie Stryder. Instead of carrying out her race's mission of taking over the Earth, "Wanda" (as she comes to be called) forms a bond with her host and sets out to aid other free humans.
After a dispute over a winning lottery ticket turns into a deadly hostage situation, the witnesses must decide exactly how far they’ll go—and how much blood they’re willing to spill—for a cut of the $156 million.