Lavender Castle S01 E18 Duelling Banjos

Having run out of fuel, the Paradox crash lands in the swamp on the planet Quagmire, near the Dank's shack. The suspicious Dank refuses to help the crew until Captain Thrice challenges him to a banjo-plucking contest. If Thrice wins, the Dank will help but the cost will be dear if the Dank wins: the Paradox will belong to the swamp creature!