I'm willing to bet the majority of Schmo's have no idea who Patrick Stewart is either. They might on a good day know "Captain Picard" or "That bald guy in X-Men"By a country mile, dude, Stewart's the most famous in the Anglosphere, and that's where Trek is targeted.
SMG, while a good actor (see "Rhonda" in The New Girl), doesn't have the same star power as the other members of TWD. And, nah, Michelle Yeoh hasn't been relevant here since like 2002. Isaacs is a rising star, but no, ask Joe Schmo on the street who Jason Isaacs is, and they'll have no idea.
Yeoh, OTOH is in a movie that was number one at the box office a couple of weeks back.