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.
John McClane travels to Russia to help out his seemingly wayward son, Jack, only to discover that Jack is a CIA operative working to prevent a nuclear-weapons heist, causing the father and son to team up against underworld forces.
A thief with a unique code of professional ethics is double-crossed by his crew and left for dead. Assuming a new disguise and forming an unlikely alliance with a woman on the inside, he looks to hijack the score of the crew's latest heist.