SpongeBob Squarepants: F.U.N

SpongeBob is convinced that Plankton is evil because he's lonely, so he befriends him. They go frolicking in jellyfish fields singing the F.U.N. song. Karen convinces Plankton to use their new friendship as a means to get the Krabby Patty secret formula. Mr. Krabs realises Plankton and Karen's plan and tries to convince SpongeBob, but SpongeBob won't listen.