In which TV series is Debra Barone a main character?

In which TV series is Mark Greene a main character? Who played John Carter in 'ER'? Who played Ray Barone in 'Everybody Loves Raymond'? Who played Debra Barone in 'Everybody Loves Raymond'? Who played Marie Barone in 'Everybody Loves Raymond'? In which TV series is Marie Barone a main character? Who played Buffy Summers in 'Buffy the Vampire Slayer'? In which TV series is Buffy Summers a main character?