| This minifigure has only appeared in video game(s)|
Although this article is about an official minifigure, it never existed in physical form or appeared in any official LEGO sets.
Jonathan "Jack" Hart's father was the inventor of a super-energy source called Zero Fluid. When thieves killed Jack's dad and partly destroyed a container of Zero Fluid, Jack was soaked in the fluid, and gained superpowers. He used his powers to avenge the murder, then joined the Avengers, taking the name Jack of Hearts.