Watch The 5th Dimension Full Movie Free Online 123Movies. When two graduate student physicist run out of time to prove their theory on time travel, they enlist the help of film students to unearth and chronicle the experiments Nikola Tesla and other scientists were involved in with the US government, which involved testing LSD, electromagnetic energy and radiation on unsuspecting citizens. When members of the film crew end up missing, the physicists realize they may have gotten much more than what they bargained.