narrated by Paul Christie ; directed & produced by Tom Mustill ; AGB Films with Gripping Films for Thirteen Productions LLC and BBC in association with WNET
narrated by Jimmy Smits ; directed and written by Peter Fison ; producer, Charlotte Lathane ; a Windfall Films West Production part of the Argonon Group for Thirteen Productions LLC and BBC Studios in association with WNET
narrated by Daniel Stern ; written and directed by Steve Gooder ; an OSF Wales production for BBC and Thirteen Productions LLC in association with WNET
hosted and narrated by Chris Morgan ; written and produced by Joseph Pontecorvo ; Pontecorvo Productions and Thirteen in association with Wildlife Media, National Geographic Channel and WNET New York Public Media