[s1e15] The Deep End May 2026

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

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

The end credits cryptically feature the "Vigenère cipher" for the first time in the series. [S1E15] The Deep End

Dipper’s crush, whose presence motivates his short-lived career in pool safety. 💡 Trivia & Details

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. The intimidating antagonist of the episode who runs

The intimidating antagonist of the episode who runs the pool like a drill sergeant.

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 . rule-obsessed head lifeguard

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