2. Cosmic Treadmill (DC)
The Cosmic Treadmill was built by Barry Allen (who, unlike his Flash counterpart Wally West can't travel through time on speed alone) so that he could travel through time. The Cosmic Treadmill is powered by cosmic rays and is built in a way that means it can be coordinated with radioactive pulses from a cosmic ray clock. It releases positive radiation when moving forward, sending its user into the future, and releases negative radiation when moving backward, sending its user into the past. Its inclusion in a live action movie would be cool for a couple of reasons; first, because it would introduce time travel to the DC cinematic universe and, second, because it would mean that we finally had our big screen Flash - which is something many of us have wanted for years and would put us that little bit closer to an epic Justice League team-up movie.