Jack Power (Marvel Comics) Jack Power (Marvel Comics) Jack Power, currently known as Mass Master, formerly Counterweight and Destroyer, is a fictional character appearing in American comic books published by Marvel Comics. He first appeared in "Power Pack" No. 1 and was created by Louise Simonson and June Brigman. Jack was a founding member of the superhero team Power Pack. The second youngest of the four Power siblings, he was 8 1/2 years old when he was given his powers by Aelfyre Whitemane, a dying Kymellian noble. He continued to operate with Power Pack through their entire history. Jack Power was born in Richmond,
Superhero comics World War II and the end of the Great Depression. In comics format, superpowered and costumed heroes like Popeye and The Phantom had appeared in newspaper comic strips for several years prior to Superman. The masked detective The Clock first appeared in the comic book Funny Pages #6 (Nov. 1936). In the Great Depression and World War II era the first Superhero Comics appeared, the most popular being Superman, Batman, Captain Marvel, Wonder Woman and Captain America. After World War II superhero comic books gradually declined in popularity, their sales hindered in part by the publication of "Seduction of the