Plankton's tank is a vehicle that appears in the episode "Atlantis SquarePantis," the video game SpongeBob's Atlantis SquarePantis, and the books Atlantis SquarePantis and My Trip to Atlantis - by SpongeBob SquarePants.
It is a large, green tank with a long rectangular window to see out from, and it has many levers in and out of the vehicle that can expand easily. It can only release ice cream.
Role in series
In both "Atlantis SquarePantis" and SpongeBob's Atlantis SquarePantis, Plankton steals the tank from the Atlantean Armory.
It is assumed that Plankton goes straight from the armory to the front of the building, assuming that the tank has very powerful fire power, but it turns out that the tank only squirts out pink ice cream.
SpongeBob's Atlantis SquarePantis
Plankton has an entire adventure that takes up two levels of the game, but this time, he is aware that the tank squirts out green ice cream. In the same game, it is shown that once Plankton was done using the tank, it is hauled away.