Three unnamed Swimmers appear in "The Amazing Threehorn Girl" as three of the four of the episode's secondary antagonists, alongside a clubtail.

Though they at first believe the lie that Cera chased away a couple of Belly Draggers, they eventually find out the truth, and they and the rest of the Valleydwellers attempt to have her exiled during the song "Is It True She Lied", only to be stopped by Grandpa Longneck.