Bruce Willis is back as poor, beleaguered cop John McClane. This time, he's traveling to Russia to hunt down his wayward son. Turns out Junior (Jai Courtney, "Spartacus: War of the Damned") is actually an undercover CIA operative. Now father and son must work together to stop a nuclear-weapons heist. It's good to see John McClane again. But with audiences summarily dismissing action flicks by Arnold Schwarzenegger (The Last Stand) and Sylvester Stallone (Bullet to the Head), is the era of the '80s action star dead and gone?97 minutes R.