Who played Nicholas Brody in 'Homeland'?

In which TV series is Ned Stark a main character? Who played Jaime Lannister in 'Game of Thrones'? In which TV series is Jaime Lannister a main character? Who played Carrie Mathison in 'Homeland'? In which TV series is Nicholas Brody a main character? Who played Frank Gallagher in 'Shameless'? In which TV series is Frank Gallagher a main character? Who played Fiona Gallagher in 'Shameless'?