A recurring story element is used as a form of tradition within a show each season. This doesn't necessarily mean it is a Recycled Script, as more often than not the only similarity is the subject. The story itself can go in many different directions. At other times it can just be a Day in The Limelight, focusing on a specific character who normally doesn't get that much attention in the regular episodes. A sister trope to Once an Episode. Much of the time it ends up as a Something Completely Different episode. Examples of Once a Season include: