Phineas and Ferb - Season 4 Episode 38 The Klimpaloon Ultimatum There is no such thing as an ordinary day to Phineas and Ferb.
Overview: Phineas and the gang help Love Händel prove the existence of Klimpaloon, the magical old-timey bathing suit that lives in the Himalayas, to verify that their song, "The Ballad of Klimpaloon", is legitimate.