The Main Drain, which sucks in all of Bikini Bottom, refers to the end-of-the-world scenario "killer strangelet." This is the second time Mr. Krabs and Plankton are shown as friends and kids.. The Main Drain is a SpongeBob SquarePants episode from season 7. In this episode, SpongeBob and Patrick seek out a legendary drain that once destroyed Bikini Bottom.
SpongeBob SquarePants - Season 7 • Episode 46 - The Main Drain starring Tom Kenny, Bill Fagerbakke, Rodger Bumpass.. What kids learn From 'The Main Drain,' kids learn about the power of friendship and the fun that comes from embarking on adventures with friends. SpongeBob and Patrick's quest highlights how teamwork can help overcome fears and challenges, promoting the idea that having a buddy by your side makes even the scariest journeys enjoyable.