James Earl Jones turned down the part of Grendel when he found out that this movie would be animated.
Second full-length Australian animated theatrical movie after Marco Polo, Jr. (1972). In between also had been the mixed animated and live-action Australian movie Dot and the Kangaroo (1977).
First Australian animated theatrical movie that contained adult themes.
The Australian DVD sleeve notes state that this movie is a "cult tale (which) is a part re-telling of the epic poem Beowulf, told from the perspective of the great monster Grendel. Revisionist in part, it presents the other side of the story, the tale of a contemplative monster desperate to find meaning in life."