SpongeBob

SpongeBob is an interesting unit seen in the BTD series as a Special Agent. Unlike most Special Agents, SpongeBob is initially seen assisting Bloons, and thus falls into a new category: Enemy Agents, which are Special Agents that help bloons and must be defeated a certain amount of times to unlock in the Special Agent store.

As an Enemy Agent, SpongeBob can be found guarding large bloon clusters and individual bloons and has the abilities to attack towers either directly with his spatula or by deflecting tower shots with the spatula. He is also a personal assistant to the M.O.A.R. Bloon with the task of healing it. He is only seen on Easy and Intermediate tracks and can appear every 3-7 rounds, and he is relatively weak with only 10 HP.

After being defeated 20 times in battle, SpongeBob is unlocked in the Special Agent store and can be purchased for $100. As a Special Agent, SpongeBob can be placed on both land and water due to his being a humanoid sponge. He can use his spatula as a sword to pop bloons or throw it like a boomerang, and can also make Krabby Patties, which serve the same purpose as Bananas but give lives instead of money.

In his Pro Form, SpongeBob is turned into a Sponge God! His regular spatula is replaced with a golden one which not only makes the sword and boomerang attacks more powerful but now allows Sponge God to shoot lightning! The Krabby Patties are worth even more and last even longer.