Forest Temple (Twilight Princess)
The Forest Temple is the first dungeon in The Legend of Zelda: Twilight Princess. It is located at the end of Faron Woods, where a spiderweb is blocking the entrance. After restring light to the province and obtaining the lantern, Link can burn the web and enter the temple.
This temple is home to numerous baboons, including the leader, Ook, who has been possessed. After rescuing four of the monkeys, Link can swing to the home of Ook and fight him. Once defeated, Ook doesn't die, but instead the bug-like being that possessed him dies. Ook runs away and leaves behind the Gale Boomerang. Using the Gale Boomerang, Link rescues the rest of the monkeys and gains access to the boss, Diababa.
Twilight Parasite: Diababa
The boss of this temple is known as Twilight Parasite: Diababa. It is a fairly easy boss, who can be defeated by blowing bombs into its face and then slashing its eye with the sword. Ook actually comes back and helps Link with this battle by holding bomblings for Link to lock onto with his Boomerang. After Link defeats it, he is gifted the first Fused Shadow and a Heart Container.