Thialfi was born mortal, to parents that were killed in a Viking raid. Thor, upset at what worship of their race was wrought, pleaded with Odin to do something. Odin made Thor a deal, he would grant Thialfi power and make him an Asgardian, but Thor must take him to Asgard, find him a home, and when he comes of age, take him into his inner circle and trust his wisdom. Once Thialfi came of age, and after Thor had taken over the throne of Asgard, Thialfi was made Thor's advisor, much to Balder's dismay. Not knowing Thialfi's history, Balder didn't trust him.
After Thor moved Asgard to earth to float over New York City, the Consortium of Nations planned an assault on Asgard to try and drive the Asgardians away from Earth. The assault failed, resulting in Asgard crashing into New York City, and costing thousands of lives, both Asgardian and human. During the assault, Thialfi was fighting Zarrko, who was trying to escape. Zarrko had opened a temporal portal, but an explosion knocked Thialfi through the portal instead, before Zarrko had the chance to calibrate it.
The portal threw Thialfi more than 100 years into the future, and he arrived in Bostogardd Harbor in New Asgard, literally crashing into Jordahl. He then meets Magni and King Thor and they show him the paradise this world has become. He befriends Magni and they try to figure out what really happened and why Thor rules the world. This leads to the discovery that Thor was a tyrant and that he killed the numerous superheroes along with his own brother Balder. He confronted Thor about the truth, but was killed by Enchantress.
Powers and Abilities
Thialfi was granted the powers of an Asgardian by Odin.
- Superhuman Speed: Blessed by Odin, Thialfi is capable of running with inhuman speed.
- Superhuman Reflexes: Thialfi is fast enough to easily dodge bullets.
- Superhuman Agility
- Superhuman Longevity: Despite being several centuries old Thialfi still looks like a young man. 
- Thor would later undo the destruction of New York, but whether Thialfi's death was undone or not is unknown due to the fact that he time traveled also.
- 21 appearance(s) of Thialfi (Earth-616)
- 2 image(s) of Thialfi (Earth-616)
- 1 quotation(s) by or about Thialfi (Earth-616)