TV highlights: Sharon Stone returns to the small screen in TNT's "Agent X"

(All times Eastern.)Shape-shifting Zygons invade the U.K. on "Doctor Who" (BBC America at 9 p.m.). A special agent follows Ash on "Ash vs. Evil Dead" (Starz at 9); Pablo gets his first taste of blood.The Isley Brothers perform some of their classic hits in a historic setting on "Legends: OWN at the Apollo" (OWN at 10).