No it's not. In a TV series, a guest star is an actor who appears in one or a few episodes (sometimes a story arc). In some cases a guest star may play an important recurring character and may appear many times in a series, despite not being a member of the main cast; they may ultimately be asked to join the main cast if their role continues.
In a TV series, a guest star is an actor who appears in one or a few episodes (sometimes a story arc). In some cases a guest star may play an important recurring character and may appear many times in a series, despite not being a member of the main cast; they may ultimately be asked to join the main cast if their role continues.