After singlehandedly chasing off five robbers, Zorro is bitten by a rattlesnake, and collapses at the farm of robber chief Alisio Turron, whose life he just spared in a recklessly engaged fencing duel; his wife Magdalena nurses the fox, resisting her initial temptation to collect the alcalde's fat cash reward on his head, but Alisio, whose Z-marked shirt she was about to mend, finds them, cowardly attacks Zorro who must fence left-handed, loses and rides to the alcalde, whose burning desire to get the fox proves too ardent once he and the lancers reach the Turron farm...