For decades, millions of people around the world have reported seeing UFOs hovering in their skies. It is a mystery that science has been unable to solve, and the phenomenon remains largely unexamined. Much of the reporting on this subject holds those who claim to have seen UFOs up to ridicule. UFOs: Seeing is Believing" takes a serious look at the phenomenon in today's world. The 90-minute special includes interviews with scientists searching for proof of life beyond earth and UFO witnesses who claim aliens are already here. Building on the original Peter Jennings report in 2005, David Muir reports on new sightings, as well as NASA's current search for life on Mars. The program follows the entire scope of the UFO experience, from the first famous sighting by Kenneth Arnold in 1947 to the present day. Muir reports on a recent UFO sighting in Stephenville, Texas, where multiple witnesses reported seeing enormous lights moving in strange configurations on the evening of January 8, 2008. He interviews some of the most credible witnesses of the sighting and a radar expert who evaluated their claims and found something surprising in the data. Sophisticated animations approved by the eyewitnesses allow viewers to get a feel for the experience first hand. The special draws on interviews with police officers, pilots, military personnel, scientists and ordinary citizens who give extraordinary accounts of encounters with the unexplained.