A lonely, Spanish-accented merman who was accidentally caught and placed in the pool.

The Pines family visits the Gravity Falls Pool on the hottest day of the year.

This episode introduces Mermando, who reappears in later episodes via Mabel’s scrapbook.

Look for the "Pool Rules" sign, which includes absurd restrictions typical of the show's humor. 🏆 Themes

Mabel meets Mermando , a boy trapped in the pool's filter section. She discovers he is actually a merman and vows to help him escape to the open ocean.

Dipper takes a job as an assistant lifeguard to be closer to Wendy. However, he is forced to work under the strict, rule-obsessed head lifeguard, Mr. Poolcheck .

The end credits cryptically feature the "Vigenère cipher" for the first time in the series.

Grunkle Stan spends the entire day trying to secure a prized lounge chair, leading to a relentless prank war with a local child. 🔑 Key Characters