Grima Wormtongue is a character from The Lord of the Rings who is first seen has a corrupted adviser to the king of Rohan. After being ousted from his post by Gandalf, Grima flees to Isengard where he assists Saruman, the former white wizard and Gandalf's former colleague. He stays with Saruman and in both the book and film eventually betrays and kills the former wizard.
Grima is a slimy, greasy character who, as his name might suggest, is very evil. He appears usually as a secondary or side character.