Jack Hart's superhuman powers are as a result of the mutagenic effect of his father's "Zero Fluid", combined with the alien genes from his Contraxian mother. He has superhuman stamina and durability. Jack of Hearts also has the ability to generate "zero energy" within his body and project it as concussive force or intense heat or as a propellant to fly. Jack is sometimes unable to exert complete control over his energies, however. For a short time after restarting Contraxia's sun, he uncontrollably radiated enough heat to melt one of Contraxia's polar ice caps. He can survive unprotected in space. Jack of Hearts's brain has incorporated the artificial intelligence of a computerized device called the Scanalyzer, enabling him to think with the speed of a computer and store and retrieve information with a computer-like capacity and efficiency.