Eugene H. Krabs and Sheldon J. Plankton have been business rivals and bitter enemies for longer than anyone can remember, but, one day, during another one of Plankton's failed attempts at stealing the Krabby Patty formula, Eugene reveals that they were not always this way. There was a time when the two rivals were actually the best friends. Through a series of flashbacks, Eugene tells the tale of how that great friendship between him and Sheldon turned sour, and how the Krabby Patty was born in the process.