The television movie Bonanza: Under Attack involves characters made popular in the long-running television western Bonanza. The story involves the dastardly Frank James hiding on the Cartwright family's Ponderosa in order to escape bloodthirsty rogue Pinkerton detectives who want to do more than simply apprehend James. James befriends the Cartwright siblings, and together they stand up to the Pinkertons.

~ Perry Seibert, All Movie Guide