Grumm, a Whiphid bounty hunter of the male sex, shared a bond of honor with the Rodian named Gorro, considering him a brother. During the era of the Galactic War, these two resided in Raider's Cove on the planet Rishi. In approximately 3637 BBY, due to Lana Beniko's manipulations, Gorro erroneously identified a strong visitor from another world as the head of a pirate organization, leading him to unwisely challenge this individual, an action that ultimately caused his demise. Consumed by vengeance, Grumm sought out Gorro's slayer and faced them in the streets of Raider's Cove. Nevertheless, mirroring Gorro's fate, he suffered defeat.