Planet Comics #10

Two adventurers don futuristic space suits equipped with radio transceivers, heating units, and ray guns to explore the planets of the solar system in this 1941 science fiction tale. Their journey takes them across the treacherous frozen wastes of Pluto, where they narrowly escape a deadly crevasse, before their vessel is ambushed by a pirate ship and they're forced down on a barren planetoid. Stranded and under attack from an alien creature, they must rely on their advanced gear and quick thinking to survive until rescue arrives.

Don Granval, a young scientist studying Neptune's strange marine life, is summoned to King Sardo's palace—only to be thrown in prison when the Neptunians blame him for a deadly poison spreading through their waters. Released to investigate on his own terms, Don traces the contamination to a hidden laboratory in the frozen north, where he discovers an old Earth enemy, Villo, orchestrating the poisoning scheme with a crew of exiled Earthmen. With science and quick thinking, Don must stop Villo's operation and convince the misled colonists to abandon their tyrant's mad agenda before Neptune's people are destroyed.