written, produced and directed by Mark Davis ; a NOVA production by MDTV Productions for WGBH/Boston in association with National Geographic Channel International
produced by Pioneer Productions for National Geographic Channel ; executive producers, Simon Andreae and Andrea Florence ; directors, Stefanie Kern and Lorne Townend
Pontecorvo Productions and Thirteen Productions LLC in association with National Geographic Channel, Sky Vision and WNET ; produced and written by Joe Pontecorvo
NGHT, Inc. ; produced by Michael Hoff Productions, Inc. for National Geographic Channel ; Victoria Kirk, producer ; Eric Anderson, Victoria Kirk, writers