It is a purple and white robot with spikes on its head, making it resemble that of a mohawk. It has spiked hammers for hands, which double as cannons. Tenderizer's eye scheme is similar to most of Plankton's robots, and even Plankton himself: A single eye with an unibrow. However, unlike the robots, Tenderizer's eye doubles as his weak point: a white target with red stripes.
Role in game
After SpongeBob reaches the end of the Krusty Krab freezer in the level, Santa, Santa, Santa!, Tenderizer, who was frozen in a block of ice, breaks free from his icy prison and attacks SpongeBob. SpongeBob ultimately defeats him and claims the wooden clarinet as his prize.
In the DS version, Tenderizer and Demento Bot switch places, with Demento becoming the boss of the Freezer and Tenderizer becoming the boss of Kelp Forest. In this version, SpongeBob and Sandy reach a certain part of Kelp Forest, which has an empty circle with no kelp inside of it. SpongeBob and Sandy prepare to practice karate, but Tenderizer intervenes and attacks SpongeBob.
Tenderizer's fight has changed quite a bit in the DS version, with him no longer using his cannons one at a time, but rather together. Tenderizer is also mobile, unlike the console/PSP versions, where he is stationary. His hammer attack has also changed; instead of attempting to smash SpongeBob when he gets too close to him, he will charge in a straight line and smash anything in his path.
SpongeBob ultimately defeats him and claims the Karate gear as his prize.