At the Dawn of Man, a group of hominids encounters a mysterious black monolith that is alien to their surroundings. A hominid discovers the first weapon, using a bone to kill prey. The bone is tossed in the air and it's a 21st century spacecraft hovering over the Earth, skipping ahead millions of years in technological development only to imply that man hasn't advanced very far at all psychologically. U.S. scientist Dr. Heywood Floyd travels to the...