Nightmare was a character that first appeared in 2002's Halloween Horror Nights: Islands of Fear, who was a demonic, nightmarish figure created to become the face of the scare zone titled Island of Evil Souls. When he returned for Halloween Horror Nights 13 in 2003, he once again had his own scare zone titled Immortal Island, and he fought Darkness in the Final Battle.
- During 2005's Tales of Terror, he made a brief appearance in the queue video for Terror Mines.
- In the Reflections of Fear event in 2008, he was mentioned on the Legendary Truth website, as a previous case for the Collective. Knightmare also appeared in the event itself in the one of the video monitors on Interstellar Terror.
|Halloween Horror Nights: Islands of Fear|
|Characters: The Caretaker (Event Icon)|
|Mazes: Fear Factor • Maximum Carnage • Project Evilution • Scary Tales II • ScreamHouse|
|Scarezones: Boo-Ville • The Island of Evil Souls • Island Under Siege • JP Extinction • Treaks and Foons|
|Shows: Bill and Ted's Excellent Halloween Adventure • Fountain of Evil • Studio 666 • Town Square of Tortured Souls|