Dan Erickson Creator Adam Scott Mark Actor Britt Lower Helly Actor Patricia Arquette Harmony Cobel Actor Zach Cherry Dylan Actor Tramell Tillman Milchick Actor Jen Tullock Devon Actor John Turturro Irving Actor Christopher Walken Burt Actor Dichen Lachman Ms. Casey Actor Michael Chernus Ricken Hale Actor Caroline Baron Executive Producer Jordan Tappis Executive Producer Beau Willimon Executive Producer Samuel Donovan Director