For eons Galactus
was a solitary being, needing only over once an Earth
century to locate a world whose energies he could consume.
However, more recently, as Galactus has found himself
forced to feed about once every Earth month, he has employed
servants to help him seek out suitable worlds to consume.
He endows these servants with portions of his own cosmic
power, enabling them to perform extraordinary feats of
energy manipulation, and he transforms them physically
so that they can travel through space and hyperspace without
starships or artificial means of protection. Because these
servants precede their master and announce his coming
to a target world's inhabitants, they have been called
Galactus's first known herald was Norrin Radd of the
planet Zenn-La, who volunteered to become Galactus's herald
if Galactus would spare Zenn-La from destruction. Galactus
transformed Norrin Radd into the Silver
Surfer, who served him for an unspecified amoung of
time. Galactus subtly erased the Surfer's memory of his
origins so that the Surfer would not sympathize with any
humanoids on planets Galactus destroyed. Nevertheless,
the Surfer rebelled when Galactus threatened to destroy
Earth the first time, and Galactus erected an energy barrier
that trapped the Surfer upon Earth as punishment.
Next Galactus transformed the Xandarian Gabriel Lan into
his new herald, the Air-Walker.
The Air-Walker was killed in a clash with the alien Ovoids,
and for a time Galactus used a robotic simulacrum of the
Air-Walker as a herald. Next he transformed a friend of
Lan's, Pyreus Krul of Xandar, into Firelord,
who served Galactus until the thunder god Thor
traded the powerful Asgardian
construct called the Destroyer to Galactus in exchange
for Firelord's freedom. However, Thor's enemy Loki
later stole the Destroyer back from Galactus.
Galactus next transformed Tyros, dictator of the world
Birj, into Terrax
the Tamer, who became his new herald. But the ambitious
Terrax fled Galactus's service and even tired to bring
about Galactus's death. Galactus stripped Terrax of his
cosmic power and turned him back to his original form.
Tyros died in a subsequent battle with the Silver Surfer.
Most recently, a young Earth woman named Frankie Rays
volunteered to become Galactus's new herald, and he transformed
her into the being now known as Nova. Nova has remained
with Galactus ever since, and will still be his herald
centuries from hence in at least some alternate futures.