Dr. Bill Foster later joins the staff of Project Pegasus, the U.S. government's semi-secret energy research facility, as a biochemical researcher. While there, he reveals his Black Goliath identity to the Thing working (at the time) in security for Project: Pegasus. In the process of answering an emergency alarm, Foster decides to change his alias to the name "Giant-Man" at Ben Grimm's suggestion. Alongside the Thing, Quasar, and the Aquarian, Giant-Man defends Project: Pegasus against Nuklo, the Grapplers, Klaw, Solarr, and the Nth Man. After working at Project: Pegasus for a short time, Foster reveals that he is dying from radiation poisoning he contracted in his earlier fight with Atom-Smasher.