Davis, who previously played the lead in Commander in Chief, has a major guest arc in the eleventh season as a surgeon at Grey Sloan Memorial Hospital. It’s not clear if her character will fill the void left by Cristina Yang’s (Sandra Oh) move to Zurich.
Meanwhile James Marsden is joining Westworld as Teddy Flood, a mysterious new arrival to a small frontier town.
He joins Anthony Hopkins, Evan Rachel Wood and Jeffrey Wright in HBO’s new version of the 1973 Western thriller.
Elsewhere Kyle McLachlan (Twin Peaks, Desperate Housewives) has a recurring role in the second season of Marvel’s Agents of S.H.I.E.L.D.