The Pines family visits the Gravity Falls Pool on the hottest day of the year.
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.
This episode introduces Mermando, who reappears in later episodes via Mabel’s scrapbook.
A lonely, Spanish-accented merman who was accidentally caught and placed in the pool.