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,
Captain Marvel (DC Comics) adventures feature him as a solo hero, he also fought evil on a regular basis accompanied by several other kids who share his powers to make up a superhero team called the Marvel Family (later referred to as the "Shazam Family" due to the issues DC Comics faced over the "Marvel" and "Captain Marvel" trademarks). The first members of the family, introduced in "Whiz Comics" #21 (Sept. 1941) and used sparingly afterwards, were the Lieutenant Marvels: three other boys from various parts of the United States who are also named "Billy Batson" and discover that, if they all say "Shazam!"