Apple is challenged to a fight by a grumpy Cheesesteak after Apple yells at Lemondrop, so he and Onion go on a quest to find the source of Cheesesteak's grumpiness by using the clues for a "chain reaction". This quest starts from the hotel, then into a room, then into a kitchen, then into the sewers, then into another room, then into Edwards School.

Apple and Onion invent a new game called bottle catch (tossing a water bottle back and forth). When Energy Bar hears about it, she steals the idea. In order to get everyone to buy the many water bottles they need to sell, they try to interest them in the bottles by having a bottle catch contest against Energy Bar and Whey.