Grima Wormtongue is a character from J.R.R. Tolkien's The Lord of the Rings. He serves as an advisor to King Théoden of Rohan, but he is actually a spy for the dark lord Saruman. Wormtongue uses deceit and manipulation to weaken Théoden and influence his decisions, leading to the king's decline. Wormtongue is characterized by his sly demeanor and treacherous nature. He is often depicted as a cowardly figure, lacking in honor and loyalty. His actions contribute to the larger conflict in Middle-earth, as he plays a crucial role in the struggle against Sauron and his allies.