There's a special day coming up at Mulberry Street School - Myrtle's Birthday! When The Gardeneers learn about how much trash is polluting the oceans they decide to throw her a "zero-waste party" - starting with decorations made from rubbish! What will Chloe make from Tino Turtle wrappers? What are those strange shiny objects in the music room? And why will everyone be clutching their stomachs before the cake is even served?? Find out all the answers in "The Trashy Birthday!"