Watch The Snail on the Slope (2009) : Full Movie Online Free The Snail on the Slope is a generative movie based on a book of the same title by Strugatsky brothers. The novel is set on an unknown planet, where humans have a base from which they are investigating and trying to conquer the Forest. The Forest, which is a huge single organism is constantly changing and fighting back. It is also dangerous and there are a lot of unexplained phenomena that they are discovering.