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As Thor jogs through Helheim, Garm chases the thunder god and gets lost. Hel enlists the help of Thomas Jefferson Jr. to find him, due to Garm being able to sense Tyr and his children. The guarddog finds the son of Tyr and chases after him. T.J. shoves the mistletoe arrow he borrowed from Balder down his throat as he lures him back to his cave. By the time he reaches his cave he is ill from the arrow, due to mistletoe being toxic to dogs, and passes out on a bed of bones before vomiting the arrow back up.
Garm was big as a Mack truck, with black fur dotted with splotches of blood.
- His Greek/Roman equivalent is Cerberus.