The Scarlet Beetle was an ordinary beetle mutated by the radiation of an atomic experiment. It gained conscious thought and the ability to command other insects. Receiving emergency impulses from his devices from his ants, Ant-Man decided to investigate what appeared to be problems in the insect world. There he found an irradiated beetle, able to communicate telepathically. The Scarlet Beetle planed to destroy the human race with the help of all the insects in his thrall (beetles, wasps, grasshoppers etc.)
Pym Particles: Using stolen Pym Particles he was able to grow to a gigantic size, with proportionate strength of an insect.
Credit: marvel.fandom.com
Key Issues & Appearances
1
Significant comic book appearances featuring Scarlet Beetle