Grendel Grendel Grendel (1981) is a Animation, Fantasy film that follows this is an animated story covering the ancient legend of Beowulf, as narrated by Grendel himself, the "monster" in the legend. Aimed more at adults than children, this version holds some interesting twists on the traditional tale, and is based on a novel by American critic and academic John Gardner. Grendel Grendel Grendel is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 3.9 out of 10 from 7 votes. Fans of animation movies may also want to explore similar titles below.