Terror from the Year 5000

Terror from the Year 5000 is a time travel horror film from 1958. Scientists build a time machine, and trade objects with someone in the year 5200. The objects from the future are radioactive, which should tell you something. They finally bring back a human from that era, but that's not a good idea. Critics said the movie has some good ideas that don't really go anywhere. The budget was low enough to create a "so bad it's good" film that was eventually featured on MST3K. YouTube commenters really like it.  (Thanks, WTM!)