5) GIANT-MAN
Debuting as Black Goliath, Bill Foster became a chief scientist at Project Pegasus, where he was exposed to excessive radiation. A blood transfusion from Spider-Woman saved his life, but seemingly left his growth powers dormant, with his body too damaged to ever become Giant-Man again. During a clash with The High Evolutionary, Bill overcame this weakness, returning to action as Giant-Man, then later Goliath, before his death during the superhero Civil War.