A series of reports chosen by "Dateline" correspondents that answers the question they most often get asked -- what their most memorable story is and why.

A crash-landed alien takes on the identity of a small-town Colorado doctor and slowly begins to wrestle with the moral dilemma of his secret mission on Earth.

A crash-landed alien takes on the identity of a small-town Colorado doctor and slowly begins to wrestle with the moral dilemma of his secret mission on Earth.

One miraculous day in rural Wisconsin the deceased rise from their graves, yet appear and act unchanged. And now it is up to Officer and single mother Dana Cypress to solve a murder case where everyone, alive or undead, is a suspect.

One miraculous day in rural Wisconsin the deceased rise from their graves, yet appear and act unchanged. And now it is up to Officer and single mother Dana Cypress to solve a murder case where everyone, alive or undead, is a suspect.

In the fogs of history and darkness, who was whispering? When the gray fog falls, who is whispering in the ear. The light still shines, the mystery has never been far away.

In the fogs of history and darkness, who was whispering? When the gray fog falls, who is whispering in the ear. The light still shines, the mystery has never been far away.

Single hopefuls looking for love complete tasks, couple off and get voted out week by week. Packed full of drama.

Single hopefuls looking for love complete tasks, couple off and get voted out week by week. Packed full of drama.

Initially an experiment in which real dates are filmed, and then viewers get the chance to apply to date the unsuccessful participants the following week. Later this aspect was removed and replaced with a cast of regular restauran...