William Shatner narrates this thrilling video about NASA's Curiosity rover, from its entry and descent through the Martian atmosphere to its landing and exploration of the Red Planet in NASA's hardest planetary science mission to date.
"Hell on Wheels" is set in the 1860s, centering on former confederate soldier Cullen Bohannan, whose quest for vengeance has led him to the Union Pacific Railroad's westward construction of the first Transcontinental Railroad.
