- "Run back home, little princess."
- ―Hailstrum to Thor
Thor Attacks Jotunheim
Hailstrum was a Frost Giant, a member of Laufey's army and easily one of the largest and strongest of his kind. He fought with Thor when he arrived along with Loki, Sif and the Warriors Three to invade his home Jotunheim, and managed to briefly keep the God of Thunder off-balance using his size and strength. However Thor eventually threw Mjølnir at Hailstrum, which crushed the Frost Giant's skull, killing him instantly.
- Frost Giant Physiology: As part of a race of humanoid giants that live on Jotunheim, Hailstrum's Frost Giant features had granted him superhuman abilities.
- Superhuman Strength: Hailstrum has strength much greater than that of a human being. He managed to keep Thor off balance using strength alone.
- Cold Immunity: Hailstrum lived his life in Jotunheim, a realm that is cold enough to kill a human, without being harmed.