Lunacy is a fanon episode of Young Justice: Invasion.
The team is alerted to a disturbance in Arkham Asylum, and find out that an invulnerable man intends to turn one of it's most notorious inmates loose on the world. Meanwhile, Dr. Fate is hunted by a mysterious sorceress out for his blood.
"Luancy" is a term meaning insanity, referencing to insanity of an intermittent kind attributed to changes of the moon. As the main plot takes place in a mental asylum, insanity is a fitting heading. The Moon also plays a important role in the ceremony Beulah intended to preform.