Galactus (Galan)

Origin
Galan was a humanoid from the planet Taa, a paradise-like world whose civilization is said to have been the most advanced of any of the known universe of that time. But when the Black Winter engulfed half of the universe it left one survivor, Galan of Taa. The winter chose Galan as it's host. Galan became Galactus and to survive had to absorb the life out of worlds...

The Heralds
Later on, Galactus started selecting heralds, these herald would seek out planets for Galactus to consume, his first herald was The Fallen One, a being capable of absorbing and using dark energy. Though The Fallen One betrayed Galactus and tried to kill him - hence the name but he was killed. Galactus' second attempt at a Herald was Silver Surfer or Norrin Radd. Galactus threatened to destroy Radd's home planet unless somebody from that planet agreed to be his herald. Norrin then became the Silver Surfer and sought out planets in order to keep his own alive. Terrax was next, he eventually identified Tyros, the tyrannical dictator of the city Lanlak on the planet Birj, as a worthy Herald of Galactus. He turned Tyros into Terrax and Tyros, appreciating his power, agreed to be his Herald. Again Galactus sought a herald, this time choosing a mysterious entity named Stardust as the recipient of the power cosmic. Although very little is known about Stardust’s history prior to becoming Galactus’ herald, he claims that he was already quite powerful even before meeting his new master. What is known is that Stardust quickly became the most fanatical of Galactus’ heralds, worshipping his master like a god. His fanaticism led him to not only seek out new planets for Galactus, but also hunt down any survivors of worlds destroyed by Galactus so that no trace of these civilizations would be left alive. After The Silver Surfer's betrayal, Galactus sought a new herald, he found Red Shift whom not much is known about but he served Galactus in order to keep his power. Later on, in order to save earth, Thor agreed to be a herald, though this didn't last long as he nearly killed Galactus by almost getting him blown up by a planet with an unstable core.

Earth
When Silver Surfer found earth for Galactus he tried to consume the planet but was stopped y the Avengers, Galactus didn't give up though as he tried to consume the planet again but was stopped by the Fantastic Four. He also occasionally had his Heralds attack the planet so that they would distract Earth's Mightiest Heroes while he consumed the planet. He was stopped many times though. One time he managed to beat the Avengers and Fantastic Four after consuming the energy of a black hole. The only way they could save the planet was by Thor becoming a herald, he betrayed him though and nearly killed him but Galactus didn't give up...

Betrayal of the Silver Surfer
When the Silver Surfer was seeking planets for Galactus to consume, he found earth. He explored the planet to see whether or not it was worthy of his masters consumption. While there he was convinced by Sue Storm to save earth, but it was too late he had already told Galactus of Earth. With the surfers help and knowledge of Galactus the Avengers and Fantastic Four were able to defeat the Devourer of Worlds. In order to ensure that Galactus wouldn't return for a while, The Surfer managed to send him across the universe and became a defender of the galaxy.

Powers
Immortality

God-level Strength

God-level Stamina

God-level Flight Speed

Invulnerability

Energy Discharges

Energy Absorption

Size-Alteration

Molecular Restructuring

Matter Transmutation

Teleportation

Force-Fields

Interdimensional & Extradimensional

Portals

Telepathy with Heralds

Telekinesis

Cosmic Awareness

Resurrection

Creation Soul

Recreation

Power/Ability Bestowal

Vitakinesis.

Abilities
Genius Intellect

Weapons
None

Suit
Powerful Cosmic Armour

Transport
Flight