Hawaii Five-0 has been off the air for a few weeks, but worry not, fans. It makes a seriously suspenseful return next Monday night.

On an episode titled "Mai Ka Wa Kahiko" (translation: out of the past), Danno is faced with an impossible decision, as a corrupt cop from back in the day resurfaces and exact revenge on this detective and his family. Who, exactly, does he threaten? What does he ask Danno to do?

Hold on tightly and watch the official CBS preview now for the answers:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.