written and directed by Klaus Feichtenberger ; producers, Dieter Pochlatko, Nikolaus Wisiak ; a co-production of EPO-Film, ORF/Universum and Thirteen in association with BBC, NDR and WNET New York Public Media
a BBC/Discovery/Antena 3 Television S.A./ZDF/Open University/Skai co-production in association with Discovery Canada ; series producer, Vanessa Berlowitz ; producers, Miles Barton, Vanessa Berlowitz, Kathryn Jeffs, Mark Linfield, Dan Rees
a co-production of BoxTV, Muse Entertainment and MediaPro Pictures for BBC produced in association with the Canadian Broadcasting Corporation, WGBH/Boston and NBDtv ; executive producers, Justin Thomson-Glover, Patrick Irwin ; producer, Michael Prupas ; written by Lee Hall ; produced by Gub Neal ; directed by Rachel Talalay
a BBC/Discovery Channel co-production in association with Wanda Firms ; series producer, Karen Bass ; produced by Justin Anderson, Peter Bassett, Joe Stevens, Hugh Pearson and Jeff Turner