Tentatively titled The Lord of the Rings: Shadow of the Past, Colbert's script will draw heavily from the "Fog on the Barrow-downs” section of The Fellowship of the Ring, sections that Peter Jackson left out of his movie adaptation featuring the fan-favorite character Tom Bombadil.

Stephen Colbert's time in late night TV is coming to an end. In May, Colbert will film his final episode after more than a decade on air. Here's all you need to know on the final weeks of "The Late Show with Stephen Colbert," and what's next for the host.