Okay kiddo, so have you ever played cards with a deck of playing cards? One of the cards is called the jack of hearts!
In Marvel Comics, the Jack of Hearts is actually a superhero with special powers. He has the ability to manipulate energy, which means he can shoot powerful blasts of energy from his hands to fight bad guys.
The Jack of Hearts' real name is Jonathan "Johnny" Hart, and he became a superhero after an accident on a spaceship gave him his powers. He wears a red and blue suit with a white star on the chest, and has a big heart symbol on his mask to show that he's a hero who wants to help people.
The Jack of Hearts has been a part of different superhero teams in the Marvel universe, like the Avengers and the Thunderbolts. He's fought against powerful villains like Ultron, Thanos, and even some of the other superheroes when they get brainwashed or taken over by bad guys.
Overall, the Jack of Hearts is a cool superhero who uses his powers to save the day and keep the world safe.