Plankton's bulldozer is a vehicle that only appears in the episode "Walking Small." It is owned by Plankton.
Plankton's bulldozer resembles a regular yellow bulldozer with an orange scoop, except that it is much smaller in size. Because of this, it can be mistaken for a toy bulldozer.
Plankton attempts to use his bulldozer to build the Mega Bucket over Goo Lagoon. Plankton warns the Bikini Bottomites to move but they do not pay him any mind due to his diminutive size. Eventually, Plankton manages to trick SpongeBob into forcing the Bikini Bottomites to leave Goo Lagoon and is seen using a different vehicle to help build the Mega Bucket.