William Shatner plays two roles: cowboy Johnny Moon and his ruthless Indian twin brother, Notah. Notah likes peyote and gets the crazy idea that he's the Comanche messiah sent to lead the Comanche nation against the white man but more specifically the dusty desert town of Rio Hondo. Moon, estranged from his brother, decides to stop Notah either by words or by bullets.
Now then, where to start.... well, it's dreadful. William Shatner plays "Johnny Moon" (mostly white) and his errant twin "Notah" (mostly Comanche) in this appallingly bad western that for some reason managed to attract the attention of Joseph Cotten who plays the Sheriff. "Johnny" keeps getting the blame for the mischief caused by his brother until finally there must be a reckoning. Sadly, this reckoning comes about 90 minutes too late to rescue this nonsense on horseback. The writing (from 4 folks, perhaps each looking after words that started with A-G, H-N; O-T etc. respectively?) is terrible, as is the direction and the score. There is some nice scenery to be seen, if you can open your eyes long enough between squirms but otherwise this is certainly not worth watching, even if the rest of your film collection has been eaten by marauding locusts and your Netflix subscription has been cancelled.