Avengers #304

« … Yearning to Breathe Free »: Visiting Ellis Island in civilian guise, Captain America, Thor, and Gilgamesh befriend a Native American youth, Charles Little Sky, who is being hunted by a fellow tribesman, the superhuman adventurer Puma. Puma explains that Charles has a dangerous unknown supernatural power and must be trained by their tribal shaman. The unconvinced Avengers keep opposing Puma until energy erupts from Charles and opens a portal from which the Hulk’s old enemies, the U-Foes, emerge. The heroes stop the U-Foes from killing the youth, but then clash with Puma again over his fate, until Charles escapes through another portal into an unknown dimension.