The music was composed and conducted by Alan Silvestri.[2] FernGully: The Last Rainforest is a 1992 Australian animated film directed by Bill Kroyer, produced by Peter Faiman and Wayne Young, and written by Jim Cox based on a book of the same name by Diana Young. It is a film with a strong environmental theme. The film features the voice talents of Jonathan Ward as Zak, Samantha Mathis as Crysta, Tim Curry as Hexxus, Robin Williams as Batty Koda, and Christian Slater as Pips.