Skrunch was Captain Qwark's monkey sidekick in Up Your Arsenal, and wore a Q-Force suit as part of the team.
He was introduced in Up Your Arsenal when Ratchet and Clank found the monkey in the forest with Captain Qwark. Skrunch had a sister in the forest who, apparently, "mated" with Captain Qwark. He joined the Q-Force and provided help to Clank in exchange for bananas. On planets where Ratchet used the Turbo Slider, such as on Tyhrranosis, Skrunch controlled the vehicle's gun.
He is referenced in other games of the R&C series.