Published by Marvel Comics, the cosmic entity known as Galactus has been a foe of the Fantastic Four for many years. Because of his need to feed upon the energy of planets that allow them to support life, Galactus employs other beings to search out suitable planets. Endowing them with a portion of his great power, Galactus dubs these agents his heralds.

There have been eight beings who have been hearld to Galactus:

- Silver Surfer
- Gabriel Air Walker
- Air Walker II
- Firelord
- The Destroyer
- Terrax the Tamer
- Nova
- Morg the Berserker