‘Doctor Who’s’ new Companion speaks

Batman had Robin, Holmes had Watson, Han Solo had Chewbacca; iconic heroes have iconic sidekicks who keep their main man sane and humanized, while providing the audience with a proxy. But whereas the Lone Ranger only had one Tonto, “The Doctor” from 50-year-old British series “Doctor Who” goes through a lot of “Companions” — so much so that new arrivals are met with fan anticipation and anxiety.