Zantor was a planet that was obliterated by the Garvak using the name Abel Crumpton.
Zantor's genetic template was contained in the Egg of Abundance, which could be seeded on a new planet. It was the mission of Lettice Butts and Radcliff, the last remaining Zantorans, to recover the Egg from Crumpton. (PROSE: The Man from DOCTO(R))