Basement Demon

The Basement Demon was the unnamed antagonist of The Tale Of The Dark Music, an episode of the children's horror-series Are You Afraid Of The Dark? Although lacking an official name the entity was heavily implied to be a demonic force (perhaps even the Devil itself) and resided within a small room inside the basement of an old house formerly inhabited by Andy's uncle. Andy (the child protagonist) moves into the house following his uncle's death and encounters the Basement Demon - which is summoned every time he plays music and takes a unique and frightening appearance each time it manifests: becoming a shadowy creature with glowing red eyes, a human-sized doll and a carnival barker as well as a field of light ranging from blue to red. Although originally terrified of the monster Andy eventually decides to use the Basement Demon to exact revenge on Koda, an older bully who continually threatened to beat him - however Andy's revenge went too far and Koda was sucked into The Basement Demon's dimension. When Andy came down to his basement he found his bike repaired (his previous one having been wrecked by Koda) and the Basement Demon informs him it will grant his every desire if he aids it. The story ends with Andy grinning as he and his newfound "ally" make a connection.