Marvin is a fictional character from the Hitchhiker's Guide to the Galaxy series created by Douglas Adams. He is a robot known for his pessimistic outlook and advanced intelligence, often expressing feelings of boredom and depression. Marvin's full name is Marvin the Paranoid Android, and he is equipped with a brain the size of a planet. In the series, Marvin serves as a companion to the main characters, providing comic relief through his sarcastic remarks. Despite his gloomy demeanor, he possesses a wealth of knowledge and often highlights the absurdity of the situations the characters find themselves in.