These twelve episodes comprise two story lines: "Alonzo Craig, Arctic Explorer" and "Horace Morton's Weather Machine". I listened to these some time ago, and to be honest they really aren't fresh in my mind. Allow me to refresh my memory, and I will come back with a semi-decent write-up.
Okay, I am back, with my brain fully refreshed!
In the first storyline, Clark Kent travels to the Arctic to find missing explorer Alonzo Craig. Which he does, in a manner of speaking: Craig has been captured by a tribe of "Indians" and drugged to believe that he is their medicine man. It's all played out as a mystery over the six episodes, and actually fairly well done. You just have to get past the geographically dubious Indians, not to mention their less than even-handed portrayal.
The second story sees Lois and Clark investigating Lois's uncle, who has invented a weather machine. Some crooks take over the machine, and use the resultant bad weather to cover for their robberies. This one is a lot more straightforward, and reminiscent of some of the lesser stories from the comic. It's just going through the motions.