Jack Hart

Jonathan 'Jack' Hart is the half-human, half-Contraxian son of an alien who developed an experimental 'Zero Fluid' energy source. Exposure to that fluid imbued Jack with vast cosmic energy generation and projection, flight, and superhuman strength — power so unstable he requires a containment suit to prevent catastrophic buildup.

Born from the fertile Bronze Age imagination of Archie Goodwin, Jack Hart made his debut in the pages of The Deadly Hands of Kung Fu #21 in 1976 — an intriguing launching pad that hints at the street-level, action-packed world he stepped into. Over a remarkable fifty-year span, he's proven himself a genuinely enduring figure in the Marvel Universe, racking up 136 catalog appearances and two collector-significant key issues that any serious fan will want to track down. His adventures have taken him through the pages of Avengers and She-Hulk, where he keeps rarefied company — sharing stories with the likes of Captain America, Iron Man, and Jennifer Walters. That's a character with real staying power, and Jack Hart is absolutely worth a deeper dive into your long boxes.