The NCIS season 17 premiere, "Out of the Darkness", reveals how Cote de Pablo's Ziva David is alive and why she stayed hidden for so long.

Very few moviegoers enjoy having films spoiled in advance. While it's fun to speculate about the next big blockbuster, nobody likes knowing everything about a film before entering the theater. With this in mind, a film's marketing has to perform a balancing act. How can trailers entice viewers to see the movie without revealing too much? Sometimes it works out, but often a movie's biggest twists can show up in trailers and ruin the whole thing! For this list, we're going to take a look at popular movie trailers and see just how much they spoil.