When people think about Lost, they think of its mysteries, whether they were explained or left open for viewers to ponder. However, that wasn't what gripped audiences as episodes unfolded. Rather, what would grip the viewers' attention was the simple mystery of "what happens next" in a given episode.

As big conflicts unfolded or characters behaved in intense, frustrating ways, those who tuned in cared more about who lived or who died than what the whispers were or any of the other island questions. The episodes listed below are some of the most stressful moments for Lost viewers because of what it could mean for their favorite characters.

Just as Audiences Loved Hurley, His Death Seemed Imminent Season 1, Episode 17, The Numbers

The episode that first introduced Lost's iconic numbers doesn't seem all that stressful, but it was. Both on the island and in the flashbacks,fan-favorite character Hurley seemed headed for death.