As the group travels east over the Misty Mountains, they are attacked by Goblins (Orcs). The Goblins take the dwarves and Bilbo into their caves. Gandalf saves them and the group flees. During their flight Bilbo gets lost, and tries to find a way out by himself. In the tunnels Bilbo finds a ring, which he puts in his pocket. By an underground lake, Bilbo meets the creature Gollum. Gollum and Bilbo play a game of riddles. If Bilbo wins the game, Gollum will show him the way out; if Gollum wins, he will eat Bilbo. When Bilbo does not know another riddle to ask Gollum, he finds the ring in his pocket and asks himself: "What have I got in my pocket?" Gollum thinks this is a riddle, but cannot answer it, and so Bilbo wins the game. Gollum is angry and does not want to help Bilbo. Gollum then goes away to get something he owns: a magical ring, which turns the wearer invisible. Gollum cannot find his ring, and realizes that Bilbo has it. Gollum goes back, but Bilbo is afraid and runs away. While running, the ring slips on Bilbo's finger and he becomes invisible. Gollum runs past Bilbo, towards the way out of the caves. Bilbo realizes that the ring makes him invisible. With the help of the ring he can follow Gollum and get out of the caves. Outside, Bilbo again meets Gandalf and the dwarves.