OK First make sure you have the Cruise Bubble
then doge the swipe by jumping and to avoid the chop jump from platform
to platform quickly. Then when the Robo-Sponge is down Robo-Plankton
will attack, defeat him with the cruise bubble but watch out for his
laser thing. Then when he's taken care of use the cruise bubble to hit
the green lights on
Robo-Sponge. After that hill start using the
KAH-RAH-TAE move, jump to one platform to
doge the RAH then after it's done spinning jump back to it to avoid the
KAH and TAE.
Keep doing this stuff until he's down.
After you do that you'll go inside his head to hit the fuses but be
careful because you don't have any extra pairs of underware. To get to
the fuses you have to destroy the Duplicator and the robots it makes
then you have to defeat Robo-Plankton with the cruise bubble. At your
fifth and over you have to use the cruise bubble to brake the fuse.
After the fifth you don't have to deal with any more Duplicators but the
platforms are small and you still have to defeat        Robo-Plankton
after you do that use the cruise bubble to go inside one of the holes in
his brain. You have to destroy three brain fuses and you win!!!