Unwish Island is the final destination for all of Timmy's most violent Timmy-hating wishes after they are wished away. All of them hate Timmy for this due to not having a great pleasurable life on the island, and they all conspired together to kidnap his friends and family to lure him onto this island.
The island is a tropical atoll that is shaped like a skull. It is located in the Bermuda Triangle. Timmy's parents, Chester, A.J., Sanjay, and Elmer are brought here and held as captives by Timmy's unwished wishes. Timmy tries to rescue them and although he succeeds, he ends up getting captured himself. Timmy convinces his enemies to let him go as they'll have nobody to hate if they leave him captured. They agree, but request a better life on the island. Timmy states he will need the magic copy machine and his fairies' wands to fix all that. The island then became a better place to live in the end when Timmy created The "I Hate Timmy" club and left dozens of clones of himself ("Too Many Timmys!") to serve (and be tormented by) the island's inhabitants, much to their enjoyment. It is assumed that, due to this, the island's inhabitants are now on friendly terms with Timmy, his friends and allies. Apparently, Dark Lazer is the only one that is not residing on the Island anymore because in his next appearance onward, he is living in his spaceship which is in outer space.