Westworld, HBO’s ambitious sci-fi dystopia from creators Jonathan Nolan and Lisa Joy, returns for a fourth season with its probing questions about the essence of human existence balanced against the societal fallout from a mass data breach and a robot uprising as larger forces plan for a big takeover. Evan Rachel Wood, Thandiwe Newton, Aaron Paul, Tessa Thompson, Ed Harris, and Jeffrey Wright all return, and West Side Story star Ariana DeBose joins the cast.