Vault of Evil #13
In "The Heat's On," a bizarre postal anomaly sends shrunken people tumbling through the mail—only to grow to full size upon delivery. Written by Paul S. Newman and illustrated by Robert McCarty, this 1974 Marvel mystery reveals a Martian entrepreneur using the post office to undercut Earth’s air and rail travel. The cover by Larry Lieber and Vince Colletta captures the absurdity perfectly, a 25-cent comic full of outlandish charm.
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The Post Office investigates boxes that contain shrunken people which expand to full size upon arrival at their destination. The business turns out to be run by an enterprising Martian wishing to compete with the rail and plane fare services.
Plot details indexed by the Grand Comics Database (CC BY-SA).