Great Scott! This page on the Telltale Games Website offers the chance to get a free copy of the debut episode of Telltale's Back to the Future game when it is released in December. All this seems to require is preordering the episode, which is currently priced at zero, though this will require a free Telltale account. As was previously announced, they are also offering a free copy of Puzzle Agent to those who preorder the full five episode series. Thanks Fibrocyte.