The weekly episodes of WandaVision that drop each Friday on Disney+ have become, very quickly, one of the TV treats I most look forward to as the weekend approaches. After seeing only the first three episodes, I was excited by this Marvel TV show’s possibilities, and mused that it might be the first television show I can remember that began as a sitcom but had the potential to morph into an all-out drama. Last week, with Episode 4, it flirted with exactly that possibility. The en