Roderick Krupp was a gravedigger gone mad. He is a serial killer who tells stories of burying people alive and killing them. These actions gave him the name Digger.
At some point before he began his serial killing, Krupp was approached by several representatives of A.I.M., who brought him into the organization briefly as a test subject for gamma-irradiated super soldier serum mixed with a small blood compound derived from samples from Simon Garth, Joseph Timms, and N'Kantu. The combined serum transformed Krupp into a deranged, sentient ghoul with the proportionate strength of the Hulk at his "calmest" state.
Digger has since gone on to work as a hired mercenary and serial killer for any criminal organization that will accept his talents.
Digger carries a shovel as a weapon.