SpongeBob and Patrick get on a bus after going to an amusement park. They get on the wrong bus that takes them to a 90 degree cliff. The cliff takes them to a dark city named Rock Bottom where many strange animals live. Patrick gets back on the bus but forgets to bring SpongeBob with. SpongeBob is stuck in the city and tries many times to get on another bus. He goes to a bus station and has to wait in a long line. When he gets to the front, there is only one bus left. He misses that bus and will have to wait the next day for another one. He hears a raspberry sound from far away. He runs back to the cliff to get away from the sound. He learns that a nice anglerfish was making the sound to give him a balloon. The anglerfish puts air in the balloon and ties it to SpongeBob's hand. The balloon takes SpongeBob up and back to Bikini Bottom. He sees Patrick getting on another bus thinking that SpongeBob is still at Rock Bottom.