A episode program usually features the set of actors enjoying characters in a famous or contemporary setting. system follows their lives activities. Before 1980s, shows (except for soap opera-type serials) typically remained static with no story arcs, main heroes premise changed little.[citation needed] If many change happened to characters' lives during episode, this was usually undone by simply end. For this reason, episodes may be broadcast in just about any order.[citation needed] Since nineteen eighties, many Streaming feature modern change in plot, figures, or both. As an example, Hillside Street Blues St In other places were two of very first American prime time theatre television Streaming to have got this sort of dramatic structure,[4][better source needed] while later Streaming Babylon 5 further exemplifies like structure in that this had a predetermined tale running over its planned five-season run.[citation needed]