While they are enjoying the longest day of the summer, Mush-Mush, Chep and Lilit realise that the forest is drying out. Worried, Mushpot explains to our friends that the Tree of Life, that regenerate the entire forest, is dying! There is only one Mushable who could help Mushpot to save the forest: Starmush. But the Mushelders haven't gotten along for years. Will they be able to put their differences aside in order to save the Tree of Life before it's too late?