"The Space Shell"
The Adventures of Superman Radio Serial - February 1945
Perry White’s extra-terrestrial personal chef, the “rhymester” and former court jester Poco from the now-destroyed Planet Utopia returns - although his lines, thankfully, are few, far between and mercifully brief. The rhyming gimmick gets old in a rush.
His amazing, transparent Space Shell which transported Poco to Earth in the company of his Terran pals is returned to him by the United States government, who remain thankful for his assistance although they couldn’t replicate the secret fuel formula which allowed the impervious, one-ton bubble to traverse boundless light-years in moments.
Poco is able to briefly refuel the machine, however, which acts primarily as a vehicle to get the doggerel-fond alien and his pal Jimmy Olsen to the North Pole. There, they team up with a pair of Eskimo siblings to confound a Nazi plot involving exploding icebergs which target Allied transports across the Arctic.
Superman, of course, helps rout the Nazi plot, although Jimmy (and to give credit where credit is due, Poco, in some small measure) do a pretty decent job of stalling the foreign fascists until the Man of Tomorrow arrives to save the day.