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,
Valkyrie (Marvel Comics) Valkyrie (Marvel Comics) Valkyrie is a fictional superhero appearing in American comic books published by Marvel Comics. The character, based on the Norse mythological figure Brynhildr, was created by Roy Thomas and John Buscema. First appearing in "The Avengers" #83 (December 1970), Valkyrie became a mainstay of the superhero team known as the Defenders and a close ally and one-time love interest of the superhero Thor. Valkyrie, also known by her Asgardian name Brunnhilde, was selected by Odin to lead his personal unit of shield-maidens, the Valkyrior. Renowned for her prowess in battle, Valkyrie is often accompanied by her winged