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Swimtastic Check-Up! is the 18th episode of Season 3.
Plot and Synopsis
The guppies learn about their organs. The Mayor gets a tummy ache while training for Bubbletucky's annual marathon and has to go to the hospital to get checked out.
Segments and Songs
Molly tried to say, "It’s time for Bubble Guppies!", Gil interrupts as he breathes in and out, and then, he checks his heartbeat, but, when he checks his tummy, nothing seems to happen. But, when he checks on Molly’s tummy, it growls.