Marvel Hulk 63 Atom Symbol T-Shirt After an experimental detonation of a gamma bomb goes awry, the Hulk is born on the Marvel Hulk 63 Atom Symbol Heather Kelly Green T-Shirt! This green Hulk shirt features a white silhouette of Bruce Banner, or the Hulk, with both the nuclear and atom symbol beside him. 60% Cotton, 40% Polyester.