When Earth-Two's Solomon Grundy visited Earth-One, he left behind some residual cells in the sewers.[1] The Earth-One Solomon Grundy is born when the Parasite uses an enhanced crystal to metabolically hasten the growth of residual cells which becomes a new, much more bestial version. During a clash with Superman, it is determined that his might is too much for the Man of Steel, so Superman flies the monster to an alien world inhospitable to all save the hardiest life as the zombie propels himself through the air mimicking his one-time adversary.[21]