Monty Tank

The Monty Tank is the World 6 boss in New Super Mario Bros for the DS. He is in the castle at the end and after defeating him the player will move on to World 8 in pursuit of Bowser Jr who takes Peach deep into the lava world. The Monty Tank is the main boss if the player didn't defeat Petey Piranha as Mini Mario and didn't progress to World 7 instead of World 6. Otherwise the boss would be Lakithunder.