Gollum
Gollum is a fictional character from J. R. R. Tolkien's legendarium. He was introduced in the 1937 fantasy novel "The Hobbit", and became an important character in its sequel, "The Lord of the Rings". Gollum was a Stoor Hobbit of the River-folk, who lived near the Gladden Fields. Originally known as Sméagol, he was corrupted by the One Ring and later named Gollum after his habit of making "a horrible swallowing noise in his throat".
The Lord of the Rings
Frodo and Sam capture Gollum, who has followed them from Moria. They force him to guide them to Mordor. They find that the Black Gate of Mordor is too well guarded, so instead they travel to a secret way Gollum knows. On the way, they encounter Faramir, who, unlike his brother Boromir, resists the temptation to seize the Ring. Gollum – who is torn between his loyalty to Frodo and his desire for the Ring – betrays Frodo by leading him to the great spider Shelob in the tunnels of Cirith Ungol. Frodo falls to Shelob's sting. But with the help of Galadriel's gifts, Sam fights off the spider. Believing Frodo to be dead, Sam takes the Ring to continue the quest alone. Orcs find Frodo; Sam overhears them and learns that Frodo is still alive.