 Mr. Lawrence voices Plankton . Drymon said , " We knew Doug [ Lawrence ] from Rocko , where he was a storyboard director and where he also did the voice of Filburt . We were showing Doug the storyboard , and he started reading back to us in his Tony the Tiger / Gregory Peck voice . It was really funny , and we wound up having SpongeBob use a deep voice when he entered the Krusty Krab for the first time " . Hillenburg loved the voice and decided to give Lawrence the part of series villain , Plankton . Aside from Plankton , Mr. Lawrence also voices recurring characters like Larry Lobster . 
