Return to The Isle of Smile and the colourful, fun-loving Mubbles - Pop, Dash, Cheery and the gang. The Mubbles love their island, especially the mysterious Uncertain Curtain, which always delivers an unexpected surprise! What will it be today?Today the Uncertain Curtain delivers a karaoke machine - which the Mubbles love for singing their cheerful songs! This makes the Doomongers on the Isle of Gloom grumpy and desperate to stop the karaoke fun.