The first part is easy -- when he does a side-ways chop, use the Cruise Bubble to hit the green lights on his body. To dodge the vertical chop, jump from platform to platform (he does this more than once). Be careful not to fall or he will start over. After every two or three hits, Robo Plankton will attack. Hit him with the Cruise Bubble when he stops firing his machine guns. He will start to use Kah-Rah-Tae after that. Jump to one platform to dodge the Rah and jump to the others to dodge the Kah and Tae. Do the same thing for the rest of the battle. When you defeat him, you will have to go in his brain to break fuses. Like always, the first is easiest. Destroy the Duplicatotron and the robots it creates, and Robo Plankton will start to fire at you. Defeat him the same way as before and go to the fuse (long light bulb object), and just hit it. Do the same thing with all the others. except you have to use Bubble Bowl, Bubble Bash, Bubble Bounce, etc. After the one with the electric gate. you will be near his brain there are no Duplicatotrons. You must defeat Plankton with small platforms and Cruise Bubble into the brainholes to hit the fuses.