Cul Borson was born to Bor Burison and to the Giantess Bestla, and was the older brother of Odin, Vili and Ve.

In his youth, while riding during the time that Earth was known as Aesheim, Cul was attacked by Giants and thrown off a peak. Breaking most of his bones, tormented by thirst, Cul splintered both his legs and belly-crawled to the camp of the slumbering giants, where he sucked the blood of all save for one. For this one remaining giant, Cul left a message in blood stating, "Gods do not live in the sky. We live on the Earth. And you do so at our pleasure.". Thus, he instilled fear in the giant, which would spread giving birth to the god of fear.
All-Father
After returning home to Asgard, Cul was watched over by a young girl with green eyes. Cul grew to have feelings for the girl, but after he healed her, she had completely disappeared, which left Cul bitter. After the death of his father, Bor, a still young Cul proclaimed that he would be King, as he was the eldest son, and promised to keep his brothers, Odin, Vili, Ve, as his trusted council.

However, Cul did not keep his word and his Worthy became his closest aids. Cul used them and his Draumar to spread fear all over the Nine Realms. Cul's brothers worked to stop the beasts that Cul released on Aesheim, but Cul confronted them, telling them to go home and allow him to rule.

Silenced and Forgotten
Many centuries later, Cul ruled over Aesheim, spreading fear, until his brothers approached his citadel. Odin slaughtered all of Cul's followers on his way to the main chamber. Locked away in the main chamber, Cul began to experience a new sensation, fear, for the first time in his life. As Odin drew near, Cul reassured himself that Odin would not kill him, as the ancient rules prevented it. He transported his Worthy away, telling them to await his call. As Odin entered the chamber, Cul proclaimed himself the Serpent and stated that Odin could not kill him due to ancient rules. Odin then stated that Yggdrasil, the World Tree, had given him a vision that stated, "In anger smites the warder of Earth, forth from their homes must all men flee; nine paces fares the son of Odin, and slain by the serpent, fearless, he sinks." Unable to kill his brother, Odin defeated Cul and sealed him deep beneath the ocean. In order to end Cul's hold on the mortals, Odin began to kill them off, in the hope that with them and the memory of the Serpent gone, their fear would not empower Cul. Odin renamed Aesheim Midgard but spared the remaining who were unaware of Cul's existence on their world.
Fear Itself
Many thousands of years later, Cul was freed from an ancient prison by his daughter, possessing Sin after she found and took the Hammer of Skadi. Looking extremely old and frail, and now called the Serpent, Cul prepared Sin's forces and called the hammers of his Worthy, to spread chaos and fear across the globe.
The hammers of the Worthy found suitable hosts and possessed them and, as the Worthy wreaked havoc and destruction around the world, the Serpent gained strength, transforming himself into a more youthful version, in addition to his staff transforming into a hammer. Almost immediately after gaining his new form, he transformed a patch of Antarctica into Dark Asgard, a darker, hellish version of Asgard with its own version of Heimdall, a creature with thousands of eyes.

Following new Asgard's creation, Thor arrived back on Earth and on the warpath to find the Serpent. The all-seeing creature alerted the Serpent to the coming of Thor and Cul dispatched his forces to greet the Thunder God, after which the Serpent revealed to Thor that a prophecy stated that it was indeed Cul who Thor slays and dies as a result, not the Midgard Serpent. Further revealing the relation to Odin, as his brother, and Thor, as his nephew, Cul tried to convince Thor to join him in his cause, which Thor promptly refused, forcing the Serpent to teleport Thor away to where two of his Worthy, Nul: Breaker of Worlds, possessing the Hulk, and Angrir: Breaker of Wills, possessing the Thing, were waiting to battle the Thunderer.

Teleporting himself there shortly after, Cul joined Skadi in battle against the Avengers, where the Serpent easily pushed back the team and even intercepted an attack from Captain America's shield, breaking it a moment after. The Serpent then raised his hammer high and slammed it upon the Earth, obliterating the city in a devastating attack and disappearing amid the blast's wake.

Attempting to destroy Odin for stealing the right to the Asgardian throne, Cul and his new Asgard, full of his followers, journeyed to Broxton, Oklahoma, home to Thor's fallen Asgard, in an attempt to use Heimdall's Observatory to journey to the true realm eternal, Asgard. After Thor was healed and returned from Asgard, Cul switched to a giant serpent form and battled his nephew, while the Avengers fought the Worthy. At the end, Thor slew his uncle with Odinsword, revealed to be Ragnarok, and died in the arms of his father, thus fulfilling the prophecy.
The day after the battle, while the Avengers prepared Thor's funeral, Odin took his brother's corpse to Asgard, cast-out all the other Asgardians, and locked himself alone with the body to guard it until the end of times, while blaming himself for not saving his son from death.

Return
Cul was later seen reborn alongside Odin during his self-exile, when the All-Father was reached by Loki. He repented from his sins, was pardoned by Odin as a reformed god, and made Royal Inquisitor and Minister of Justice.
One of his first tasks was to retrieve the mystical hammer Mjolnir from the new Thor. He later confronted her while possessing the Destroyer Armor. Cul briefly managed to take Mjolnir from her, but Thor was able to summon it back to her hand. Thor struggled against Cul until aid came in the form of Odinson, Freyja, and an army of the women Odinson had suspected to be the new Thor. After a fierce battle, Freyja convinced Odin to order Cul to end his attack by mocking the All-Father.

War of the Realms
Following the disappearance of the Odinson and the beginning of Malekith's War of the Realms, Odin became a tyrant and began to rule Asgardia with an iron fist. He created the Thunder Guard to protect his sovereignty and appointed Cul to lead it. When Odin took his wife Freyja with him to the Odinsleep to help her recover from poison administered by Loki, Cul ruled Asgardia in Odin's place as regent. Later, after finding Loki, Cul told him to warn the Dark Council that Asgardia was off-limits to them. During his time as ruler of Asgardia, Cul was forced to fend off an invasion from the Shi'ar Empire instigated by the Shi'ar gods K'ythri and Sharra.

Odin eventually emerged from the Odinsleep and reprimanded Cul for being an incompetent ruler. When the Mangog attacked Asgardia in its mission to kill all the Asgardians, Cul took Queen Freyja to the Destroyer Armor so she could pilot it to fight Mangog. Cul also watched as Mangog ripped the armor apart and left Frejya in pain. Cul fled Asgardia along with the other Asgardians for the safety of the Moon.
When the War of the Realms approached its zenith, Odin sent Cul on a mission to Svartalfheim to find out how Malekith's forces traveled undetected to Heimdall.This weeks-long quest had Cul discover the existence of the Black Bifrost. After informing Odin of its location, Cul stayed behind to learn as much as he could about Malekith's plan and the workings of the Black Bifrost.

Cul eventually decided to raid the mines where the Dark Elves mined magical crystalized mushrooms that powered the Black Bifrost in order to use them as ammunition to destroy it. In the mines, Cul came upon children Dark Elves that were being enslaved to mine the explosives. He initially intended to leave them behind despite their begging, but he changed his mind after reinforcements arrived. Cul unshackled the children and had them flee while he held the soldiers back. In battle, Cul was mortally wounded and used his last moments to reflect on his life, and came to renounce his previous way of thinking, embracing the power of love. As he detonated a pile of explosives to destroy the mine, Cul cherished that he had finally worthwhile. Following Cul's death, the children that he had liberated would fight against their kin to stop Malekith's war in Cul's name.

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