What was with the special actors? Who hired a special actor?

Special actors usually refer to actors who play specific roles in movies, television dramas, or plays. They are not official actors but are invited by the producer or director to join the performance temporarily. Special actors usually did not have contracts but were paid by the hour. Their pay and performance were directly related to the producer or director. The appearance of special actors was usually only when the plot needed them or when there was a shortage of actors. The producers or directors would only consider inviting them to join the show. Special actors usually don't have professional training, but they usually have enough experience to play the role and can bring some unique effects to the whole performance.