Star Trek: Nemesis. The final TNG-movie watch-along! Released in 2002, the last of the four TNG movies is an uncharacteristically dark affair. It has very little of light-hearted hijinks of the previous three and ends *pretty* sadly. That said, it starts with the wedding of Troi and Riker; Data has been promoted to new first officer; everything is peachy-keen.
Then the Romulan senate is attacked by a poison bomb or something, killing everyone present and we learned of the sister planet to Romulus–namely, duh, Remus. Apparently there is some enmity there?
Enterprise is dispatched to figure out what is going on and how to bring peace back. That still seems well in hand. But then he learns that the leader of the Reman forces is a young clone of himself (Tom Hardy). Thus begins a psychological game of cat and mouse (or cat and cat) with just the future of the entire planet of Earth hanging in the balance.
Be sure to have tissues at the ready.