Bonjour, Mark...
Paris, 2371. Mark Johnson is in a cafe in Paris, nibbling on a pastry. He hears "Bonjour, Mark." His Kathryn is there, and they kiss.
Janeway later explains that the Maquis ship was caught in the Badlands plasma storms and destroyed, though Tuvok escaped safely. Tom saved Voyager from the same fate through adept pilotage after the pilot was killed. In reality, Janeway used the Caretaker array to return home, and allowed the Maquis to slip away.
Years begin to pass. Janeway and Matk marry, raise a family, grow old. Then, 25 years after Voyager returns home, a massive Borg invasion shows up in the quadrant. Whole worlds are lost, and Earth itself faces assimilation.
It is revealed that an unknown hardliner member of the Q continuum, seeking to undo all the changes that happened due to Voyager, sent Kathryn back in time and allowed her to make her decision differently. But the consequence is that with no Janeway to stop them, the Borg expansion occured. At the end, Q (the real one) shows up and offers to let her reverse her decision. Knowing what she must do, a silver haired and heartbroken Janeway says to her husband: "Au revoir, Mark."
Next: That Escalated Quickly