Tonight on History Channel's "Missing in Alaska," the episode is "Alaska's Body Snatchers" A missing hiker and UFOs. Episode airs at 10:03 pm. (Yeah, I'm not crazy about this "off times" airing of shows either. More than a few times, I look at the TV on the hour, saw it wasn't the show I wanted and figured I missed it, so turned the channel.)
Before that, enjoy a new episode of "Ancient Aliens" about aliens and robots at 9:00 pm.