Plankton knew that he would never win and possibly be destroyed if he continued the same old sneaky battle tactics. He decided to spend a long amount of time building up his weapons. He built robots, guns, explosives, and even an armored vehicle for himself. He would occasionally build a robot of himself and send it at the krusty krab, mostly to trick them into thinking he was still doing the same stuff. The Krusty Krab Army could not simply blow him up, however, because that would violate their contract with the UGG. However, when Plankton eventually came out and attacked, they knew they had to fight back.