Bonanza series's long run. In 2002, "Bonanza" was ranked No. 43 on "TV Guide"s 50 Greatest TV Shows of All Time, and in 2013 "TV Guide" included it in its list of The 60 Greatest Dramas of All Time. The time period for the television series is roughly between 1861 (Season 1) and 1867 (Season 13) during and shortly after the American Civil War. During the summer of 1972, NBC aired reruns of episodes from the 1967–1970 period in prime time on Tuesday evening under the title Ponderosa. The show chronicles the weekly adventures of the Cartwright family, headed by the
Bonanza more season, whereupon Williams found himself pushed out of the part; it was rumored that Landon and Greene felt threatened by the studio initiating a precedent of successfully replacing one heroic leading man Cartwright with a new one, particularly in view of Williams' popularity with viewers. Williams had previously portrayed the titular character in Walt Disney's "Zorro" television series, and went on to play the lead in "Lost in Space", a science fiction television series, after the role in "Bonanza" ended. After graduating from the University of Cincinnati, David Canary was offered a left-end position with the Denver Broncos, but