(More Fun Comics 068, 1941)
Mister K is an unspecified enemy agent encountered by macho adventurer Clip Carson in Panama. His plots and schemes are pretty rote – any comic set in Panama is almost certainly about trying to sabotage the Panama Canal, after all – but his tool of choice is a carnivorous plant called the Devil-Flower, so that’s fun.
Interestingly, we last saw Clip Carson battling unspecified enemy agent Mister Z in Colombia. Assuming a linear distribution, we can assume that a theoretical Mister A is stationed… somewhere near the border between Costa Rica and Nicaragua?