When you search for a TV show from the US, Google's Knowledge Graph card now shows the latest episodes. "For example, say that you're wondering when the next season of The Walking Dead starts. Try searching for [the walking dead tv show] and you'll see all episodes listed along with their air dates," explains Google.
I've searched for [Breaking Bad], [Seinfeld], [Dexter], [Modern Family] and the results are pretty good. Unfortunately, when you click on the episode title, Google displays a card that doesn't provide a lot of useful information. It's just the first paragraph from the corresponding Wikipedia article. Here's an example: "'Problem Dog' is the seventh episode of the fourth season of the American television drama series Breaking Bad, and the 40th overall episode of the series. It originally aired on AMC in the United States on August 28, 2011." Google should use the plot summaries from IMDb.