The children of Greendale have been practising for "Karaoke Night" and cannot wait for it to be time to sing. Everyone has a number prepared and are ready to shake their stuff on the special stage that's been put up. The Karaoke Machine is pretty special too – it's solar powered! But as it turns itself on in Pat's van all it's charge is used up and so it turns itself off half way through the night. Oh dear! What will they do without the music to sing along to? Pat realises just in time his special big van has just the power they need to help! Sing on, Greendale and sing on PAT!