There is no Zorro in this serial despite the title, but there is the Black Whip who does a similar job. Idaho is a largely lawless territory which wants to change that with statehood. Local hoodlum Dan Hammond (
Francis McDonald) doesn't want any pesky things like law and order getting in the way of his activities though and is determined to block any attempts. Newspaper owner Randolph Meredith (
Jay Kirby) is one of the major proponents of statehood which makes him a target for Hammond, luckily Randolph is secretly the Black Whip.
Randolph / the Black Whip dies after a fight with Hammond's goons but his sister Barbara (Linda Stirling) dons the Black Whip costume and continues the fight against Hammond with the help of agent Vic Gordon (George J Lewis)...
What follows are a standard series of fights, speeded up horse riding and revolvers which contain an amazingly large number of bullets plus lots of cliffhangers of course. This is a decent if not exceptional serial but what makes it stand out is the female lead which was highly unusual for it's day.