History
The past history of Doctor Spectrum of Earth-1121 remains unrevealed, but it is presumably similar to that of the Doctor Spectrum of Earth-712. As much of their histories coincide with one another.
At some point in Doctor Spectrum's history one of his world's governments decreed that super-powered beings were a threat to the status quo and to be destroyed. Inventing a bomb to destroy them all, all the members of the Squadron Supreme (and presumably every other super-being on Doctor Spectrum's Earth) were destroyed by its explosion, with the exception of Hyperion.[1]