Born as a Snow Barbarian in Krakenheim, Thundarr was captured as a youth by a raiding rival tribe and sold into slavery. He was eventually bought by a slave master and trained as a gladiator in the pits in Rauxes of the Great Kingdom. He was never defeated in the pits and eventually won his freedom.
He has most recently been seen in the company of Baron, the gnome slaver. Thundarr's only interests are crushing adversaries, looting, and debauchery. Baron is the only individual he trusts.