One More Stupid Common TV Show Trivia Game and Then I'll Quit for the Month

What show do "The Wild, Wild, West"'s Robert Conrad and "Night Court"'s John Larroquette have in common?

What show do "Boardwalk Empire"'s Shea Whigham and "Gilmore Girls"' Chad Michael Murray have in common?

What show do "Silicon Valley"'s Martin Starr and "Cougar Town"'s Busy Phillips have in common?

What show do "Barney Miller"'s Ron Glass and "Homeland"'s Morena Baccarin have in common?