The Visitor, on FOX
Centropolis; IMDb; TV Tango; Wikipedia

This lasted just 13 episodes, and I don't remember it well. And it probably wasn't too great, but it was okay. John Corbett played a pilot named Adam MacArthur, who'd been abducted by aliens, fifty years ago, and then returned in the present, not having aged. I think he wanted to find his family or something, but mainly he just went around contacting people who he figured could do things to change the future. He'd learned a lot of stuff from his time in alien captivity, along with other abductees, and they all knew the world was gonna end soon or something, and they weren't going to do anything about it. But Adam escaped and returned to Earth to try to influence people who could influence events or whatever, and change Earth's destiny. But the other abductees weren't happy about this. Um... and that's about all I can think to say. It was kinda interesting, I guess.