Police Comics #80

In "Penetro, Master of Solids," the disgruntled Professor Growley transforms himself into the intangible thief Penetro, using a revolutionary equation to phase through walls and steal rare treasures. When Plastic Man, disguised as a woman, sets a trap to catch him, Penetro's powers are turned against him in a moment of unexpected vulnerability.

When Officer Dan Richards encounters an elderly farmer devastated by a mysterious blight called strangleweed that's destroying the countryside north of Midtown, his day off becomes an investigation into the plant's origins—leading him and his dog Thor to a botanist with suspicious connections and a sinister secret. As Manhunter digs deeper into why certain parties are eager to buy up the plague-stricken farmland, he uncovers a ruthless scheme that puts him directly in the grasp of the very menace he's been tracking. This tale from Police Comics #80 (1948) weaves together rural desperation, botanical horror, and the kind of cunning villainy that only a determined hero and his loyal companion can expose.