The Langley Falls Aquarium is where Jeff Fischer hopes to partially restore Hayley to her mental self in "Hayley Smith, Seal Team Six".
When Roger's attempt to find out the cause of Hayley being a grump is interrupted by Stan, she is left mentally as a six year-old.
Jeff and Klaus discover that a news story featuring baby seals being clubbed to death and changed Hayley during her seventh birthday party so Jeff takes her to the aquarium in the night with Klaus, hoping that he can trigger a partial regression to her normal self by seeing animals being treated unfairly without killing one. But when Klaus jumps into the seal tank to show how small it is, he finds himself fighting for his life from Harpy, the aquarium's beloved seal. With no other option, Jeff is forced to club Harpy to death, but Hayley is distracted by the gift shop and misses it, although two police officers as well as park security cameras capture the event and Jeff is sent to trial.