Silver awakens and talks with the girls, and Penelope asks him to sing. Silver could sing beautifully in the past, but now his singing voice is awful because of a strange incident that happened in the Greenhouse years ago, which involves the Greenhouse's glasses. To cheer him up, Mackenzie and Penelope try to discover the whereabouts of the girl Silver had mentioned. After some searching, Mackenzie discovers that Colleen is the girl Silver saw, and asks her to talk with Silver. The two become great friends, but when Colleen touches the Greenhouse's glass, Colleen disappears and Silver regains his singing voice. Later in the Bonus Episode Colleen learns a way to become visible again by using the Greenhouse's glass, but when she is visible Silver loses his singing voice, and gets it back when she turns invisible again. Colleen winds-up Silver when needed.