The teacher, Mr. Slink, assigns an environmental project, and Halo Nightly pairs up with Flora, the school's resident treehugger. Their team has the assignment in the bag (reusable, of course). But when the evil Doozie Hiss ruins their chances for a good grade, Flora changes from happy hippie to eco-terror. With her superpowered candies, Halo faces off against the Green Queen of Mean!