Kandor - All-Star Superman

In All-Star Superman #10 by Grant Morrison and Frank Quitely, the series includes elements of the Silver Age Superman continuity; Kandor has not been enlarged. Facing death from overexposure to solar radiation, Superman releases Kandor from its bottle on Mars, where they all become super-powered, but are far enough removed from Earth to neither pose a threat to, nor be culturally affected by, humanity. The Kandor Emergency Corps, however, do travel to Earth with Superman to battle the diseases afflicting children in a terminal ward.

Read more about this topic:  Kandor