The movie Millennium was released in 1989 and directed by Michael Anderson. It stars Kris Kristofferson as Bill Smith, an investigator for the National Transportation Safety Board, who is tasked with investigating a mysterious airline disaster. During his investigation, he discovers that the cause of the crash was not a mechanical failure or human error, but rather the involvement of time travelers from the future.
The future Earth depicted in the movie is one that is irreparably polluted, and the time travelers have come back to the past to collect people who are about to die in order to rejuvenate the human race. The time travelers are led by a woman named Louise Baltimore, played by Cheryl Ladd, who becomes romantically linked with Bill and helps him in his investigation.
As Bill delves deeper into the conspiracy, he discovers that the time travelers have been causing disasters throughout history, including the sinking of the Titanic, in order to collect people to repopulate their dying planet. He teams up with a skeptical scientist, played by Daniel J. Travanti, to find a way to stop the time travelers before they cause more harm.
The movie features some impressive special effects for its time, particularly in the depiction of the time travel sequences. It also raises interesting questions about the ethics of using time travel to save a dying civilization, and the potential consequences of meddling with the past.