The crossroads of science fiction and science fact are explored via clips from "Star Trek" and "Star Trek: The Next Generation," and interviews with scientists and researchers, including Carnegie Mellon's Alex Choset, who has developed a robotic-surgery tool, and MIT's Hugh Herr, who's working on a Borg-like integration of flesh and machine. Among the topics: whether teleportation and invisibility cloaks are possible. LeVar Burton hosts.