When there is not a single leading actor, the main roles are called ensemble cast, which comprises multiple principal actors and performers who are typically assigned roughly equal amounts of screen time. A supporting actor is an actor who performs a role in a play or film below that of the leading actor(s). Supporting roles are above that of a bit part, which is direct interaction with the principal actors and no more than five lines of dialogue, often referred to as a "five-or-less" or "under-five" in the United States, or "under-sixes" in British television. When a well-known actor or other celebrity appears in a bit part, it is called cameo appearance.
