|Powers and abilities|
|First appearance||Hulks On Ice|
Ymir is the most powerful Frost Giant. He rules over the land of Niffelheim. He is so old that he predates any of the gods with Surtur being the sole being in the Norse cosmos older then him.
Ymir is awakened from his ice volcano prison on Earth by Laufey as part of the Frost Giants' plot to bring an endless winter to Earth. Ymir then attacks Thor and the Agents of S.M.A.S.H. as they work to defeat Ymir. When Skaar tried to repeatedly stab Ymir, he froze Skaar who was caught by A-Bomb before he can hit the ground. Thor tells Hulk that they will have to find Ymir's weak spot. Skaar's sword was left in Ymir as the Hulk's act as they attack the weak spot. Before Ymir can hit A-Bomb, She-Hulk gets both of them out of the way. Thor comes up with a plan where he and Hulk attack Red Hulk enough to heat him up and throws him towards Ymir which cracks up Ymir. Thor then fires his lightning which shatters Ymir as Laufey retreats back to Jotunheim.
Ymir is a huge ice giant over 1,000-foot (300 m) tall and possesses immense strength and durability greater than most other giants. Ymir is one of the few beings whose power makes him capable of battling Surtur and Odin to a standstill. The character can generate intense, deadly cold and regenerate from as little as a particle of ice. Ymir also carries a huge icicle which functions as a club. The character is an ancient being devoted to destruction and little else.