Klump first appears in the game Donkey Kong Country. He along with other Kremlings stole the Kongs' Banana Hoard and knocked out Diddy Kong, in which Klump had him sealed in a barrel. Klump and the Kremlings take all Banana Hoard in his industrial base and send them to the Gang-Plank Galleon later.[5][3]

In the game, Klump wears an army helmet to protect his head. Because of this, he is immune to Diddy's jump attacks. He can be defeated by other methods, like Rambi the Rhinoceros' horn, a rolling attack (by Donkey Kong)/cartwheel (by Diddy Kong), or from a barrel tossed at him. Unlike Diddy, Klump is vulnerable to DK's jump attack, but in the game beta, he also ricochets off Klump's helmet. Klump appears in six stages: Jungle Hijinxs, Torchlight Trouble, Trick Track Trek, Elevator Antics, Blackout Basement and Platform Perils.

In the Gang-Plank Galleon's fake credits cutscene, Klump is in charge of the game's KONCEPT.

In the Game Boy Advance version of Donkey Kong Country, the Kong Family obtain a Klump's photograph when Donkey Kong uses his Hand Slap move on the enemy.