Fortunately, Rocketman is on the job!
See, it is so a planet!! Still, the "inhabited by a race of idiots" is kinda harsh, science dude.
Ahh, but we have the glimmerings of a plot here...
Rocketman flies to Pluto...
...but only a fool brings a brain to an idiot fight!
King Morono?!?
OK, well named.
Hey, they stole the plot of The Krotons!! (Yes, I know this came first, but time travel and stuff)
Fortunately, Rocketman has seen through the Plutonians Achilles
Time to beat up idiots!
Or maybe not...
What--no use beating up unintelligent babies? What kind of Earth man are you, Rocketman?!?
From Rocketman #1 (1952)