So who the heck is Antonio Karrell- according to the locals, he's supposedly been dead for centuries, even though he's still spoken of as alive. Nonetheless, it seems he's somehow got a voodoo spell over an intimidated small Cuban town that causes them to pay a money tribute even though he allows no needed changes in the town. So when the professionally-driven Dr. Graham comes from the US to treat the town's many sick, they quake in fear as to what the Karrell's voodoo curse will do.
There's some suspense as to who or what Karrell is that plays out unfortunately in somewhat awkward fashion. It's a rather unusual entry, dealing as it does with the non-Hollywood 3rd World, in addition to the supernatural issues. There's also a moral here about the superiority of Western science to beliefs of the past, which I suppose is well and good. I do wish, however, that we saw more of a pre-Perry Mason Raymond Burr, all made up here as a swarthy, big-eyed Cuban cop. In a bigger, more pivotal role, he could have provided much needed jolt for this imaginative if rather disjointed episode.