Gravity Falls
Twin brother and sister Dipper and Mabel Pines are in for an unexpected adventure when they spend the summer helping their great uncle Stan run a tourist trap in the mysterious town of Gravity Falls, Oregon.

Season 1 · Episode 15 ·
The Deep End
When Mabel befriends a cute merman trapped in the public pool, she's determined to help him out. Meanwhile, Dipper decides to volunteer as a lifeguard to see Wendy.
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Episode 15 of season 1 of Gravity Falls: “The Deep End”. Aired 2013-03-15. Watch it online free on ZapFlix.