MPack
Bomb-Selling Pirate
Season 1: I Was a Teenage Gary
Season 2: I'm with Stupid
Season 3: Party Pooper Pants
Season 4: Good Neighbors
Season 5: Whatever Happened to SpongeBob?
Season 6: Boating Buddies
Season 7: One Coarse Meal
Season 8: Pet Sitter Pat
Season 9: SpongeBob You're Fired
Season 10: House Worming
Season 11: Shopping List
Season 12: SpongeBob's Bad Habit
Season 13: Pat the Dog (so far)
I'll probably update this post once Season 13 finishes if I find an episode from that season to be worse that Pat the Dog.
Season 2: I'm with Stupid
Season 3: Party Pooper Pants
Season 4: Good Neighbors
Season 5: Whatever Happened to SpongeBob?
Season 6: Boating Buddies
Season 7: One Coarse Meal
Season 8: Pet Sitter Pat
Season 9: SpongeBob You're Fired
Season 10: House Worming
Season 11: Shopping List
Season 12: SpongeBob's Bad Habit
Season 13: Pat the Dog (so far)
I'll probably update this post once Season 13 finishes if I find an episode from that season to be worse that Pat the Dog.